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08-26-2004, 08:41 PM
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#1
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Aquarium Advice Addict
Join Date: May 2004
Location: Peoria, IL
Posts: 1,757
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Hydrometer issues
One Hydrometer reads 1.024. (marine labs Instant Ocean)
The other 1.020 (coralife Deep Six)
who do I trust?
__________________
Hardware: 37 gallon SW tank and stand by Oceanic Systems, Magnum 350 Pro Canister Filter (half carbon), CPR Bak Pak 2R skimmer, Maxijet 1200 Powerhead, RenaCal 150 W heater, Compact fluorescent lights with moonlights. 40 lbs of liverock, 3" sand bed.
Software:2 Tank-Raised Ocellaris Clowns, 1 Purple Firefish, 1 Electric Orange hermit crab, 18 Blue Legged hermit crabs, 8 or so Nassarius snails, Xenia, Blue, green, and Green Striped Mushrooms.
Click here to vote for AquariumAdvice.com: The friendliest, fishiest place on the net!
Central Illinois Marane Aquarist (CIMA) member.
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08-26-2004, 09:01 PM
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#2
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Aquarium Advice Addict
Join Date: Oct 2003
Location: PA
Posts: 1,869
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You trust a refractometer 
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08-26-2004, 09:04 PM
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#3
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Aquarium Advice Addict
Join Date: May 2004
Location: Peoria, IL
Posts: 1,757
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thanks for the help. 
__________________
Hardware: 37 gallon SW tank and stand by Oceanic Systems, Magnum 350 Pro Canister Filter (half carbon), CPR Bak Pak 2R skimmer, Maxijet 1200 Powerhead, RenaCal 150 W heater, Compact fluorescent lights with moonlights. 40 lbs of liverock, 3" sand bed.
Software:2 Tank-Raised Ocellaris Clowns, 1 Purple Firefish, 1 Electric Orange hermit crab, 18 Blue Legged hermit crabs, 8 or so Nassarius snails, Xenia, Blue, green, and Green Striped Mushrooms.
Click here to vote for AquariumAdvice.com: The friendliest, fishiest place on the net!
Central Illinois Marane Aquarist (CIMA) member.
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08-26-2004, 09:21 PM
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#4
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Aquarium Advice Regular
Join Date: May 2004
Location: Ottawa,Canada
Posts: 98
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When I bought my hydrometer at the LFS they told me to bring in some of my tank water next time and they'll use their refractometer on it and tell me how far I'm off. That way I can compensate. Maybe your LFS will do the same.
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08-26-2004, 09:29 PM
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#5
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AA Team Emeritus
Join Date: Mar 2004
Posts: 5,833
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I recently purchased a refractometer and found my was reading hydrometer was .002 too low. 8O
Its a very good purchase, especially for a qt tank setting where you are doing a lot of water changes. Or maybe you can at least borrow one to find out your true mix.
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08-27-2004, 02:20 AM
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#6
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Aquarium Advice Addict
Join Date: Dec 2003
Location: Rosemount, MN
Posts: 1,091
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well i just tested my refractometer tonight with some ro/ di water it haqd been a long time since i did that and boy oh boy was i shocked it was reading 35pp before i recalabrated it and after it was reading 40 ppm a difference of 5ppm it was off. man that makes me mad. i have no idea how it got off that much. but now i will be testing it about once a month or more. i thought you could set it and never have to test it again.
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A 46 gal bow front (Soft coral) reef tank with a 10 gal sump. And a 30 gal ( SPS and Clam) reef tank hooked up to the sump of the 46 so they share water.
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08-27-2004, 03:50 AM
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#7
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Aquarium Advice Freak
Join Date: Jul 2004
Location: USA
Posts: 320
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I use a refractometer and when compared to a hydrometer reading the hydrometer was .002 higher than the Refractometer.
I highly recommend a Refractometer.
__________________
72Gallon Bow Tank | LS/80lbs LR.com Keys LR 20Lbs Base Rock | fluval404 | Remora Skimmer | Red Sea Pro Wave Maker | 4 Maxi Jets 2/1200 2/900 PH | PinPoint PH Monitor | ARTICA 1/10 HP Chiller
Lighting: 48'' Coralife HQI aqualight pro | 2 150 watt MH | 2 96 watt true actinic fluorescents | 3 1 watt blue-moon-glow LEDs
Fish&Inverts: 3-BlueGreen Chromis | Shrimp Goby | Purple Firefish | 6 Line-Wrasse | LawnMower Blenny | Royal Gramma | Coral Beauty | Maxima Clam | 16 Assort. -Snails | LR Hitchers: Crabs, Urchins, Brittle Stars, Feather Dusters, and more
Corals: Assorted Mushrooms | Green Button Polyps | Toadstool Leather | Pulsing Xenia | Clove Polyps | Star Polyps | FrogSpawn | Branching Hammer | Candy Cane | Zoos | Ricordea | Open Brain | Bubble |
--------------------------------------------------------
24Gallon JBJ Nano Cube | LR 25lbs Marshall Creek/Tonga/Fiji | 2 Flase Percula Clowns | Shrooms | Xenia | Green Button Polyps | Snails | Hermits
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08-27-2004, 03:51 AM
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#8
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Aquarium Advice Freak
Join Date: Jul 2004
Location: USA
Posts: 320
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I use a refractometer and when compared to a hydrometer reading the hydrometer was .002 higher than the Refractometer.
I highly recommend a Refractometer.
__________________
72Gallon Bow Tank | LS/80lbs LR.com Keys LR 20Lbs Base Rock | fluval404 | Remora Skimmer | Red Sea Pro Wave Maker | 4 Maxi Jets 2/1200 2/900 PH | PinPoint PH Monitor | ARTICA 1/10 HP Chiller
Lighting: 48'' Coralife HQI aqualight pro | 2 150 watt MH | 2 96 watt true actinic fluorescents | 3 1 watt blue-moon-glow LEDs
Fish&Inverts: 3-BlueGreen Chromis | Shrimp Goby | Purple Firefish | 6 Line-Wrasse | LawnMower Blenny | Royal Gramma | Coral Beauty | Maxima Clam | 16 Assort. -Snails | LR Hitchers: Crabs, Urchins, Brittle Stars, Feather Dusters, and more
Corals: Assorted Mushrooms | Green Button Polyps | Toadstool Leather | Pulsing Xenia | Clove Polyps | Star Polyps | FrogSpawn | Branching Hammer | Candy Cane | Zoos | Ricordea | Open Brain | Bubble |
--------------------------------------------------------
24Gallon JBJ Nano Cube | LR 25lbs Marshall Creek/Tonga/Fiji | 2 Flase Percula Clowns | Shrooms | Xenia | Green Button Polyps | Snails | Hermits
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08-28-2004, 05:03 PM
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#9
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Aquarium Advice Addict
Join Date: May 2004
Location: Peoria, IL
Posts: 1,757
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Update: I purchased a third hydrometer. a floating, bobber looking kind. it reads the SG as being 1.020. so i will assume for now that if 2 of the three are reading the same. than those are the most accurate.
the LFS hydrometer (same as my deep six) read .003 lower than mine did in their water.
so who knows.
What is the danger zone for fish and inverts? how far off of 1.025 can I be and still be ok?
__________________
Hardware: 37 gallon SW tank and stand by Oceanic Systems, Magnum 350 Pro Canister Filter (half carbon), CPR Bak Pak 2R skimmer, Maxijet 1200 Powerhead, RenaCal 150 W heater, Compact fluorescent lights with moonlights. 40 lbs of liverock, 3" sand bed.
Software:2 Tank-Raised Ocellaris Clowns, 1 Purple Firefish, 1 Electric Orange hermit crab, 18 Blue Legged hermit crabs, 8 or so Nassarius snails, Xenia, Blue, green, and Green Striped Mushrooms.
Click here to vote for AquariumAdvice.com: The friendliest, fishiest place on the net!
Central Illinois Marane Aquarist (CIMA) member.
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08-28-2004, 05:15 PM
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#10
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Aquarium Advice Addict
Join Date: May 2004
Location: UK
Posts: 2,468
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With inverts, I would say +/- 0.003 of 1.025 is the range you want to stay within.
You would be better off with a refractometer instead of 3 hydrometers.
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My wife and I were happy for twenty years. Then we met.
- Rodney Dangerfield.
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08-28-2004, 05:55 PM
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#11
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Aquarium Advice Addict
Join Date: May 2004
Location: Peoria, IL
Posts: 1,757
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I know. I just dont have the 90 bucks to shell out for one right now.
__________________
Hardware: 37 gallon SW tank and stand by Oceanic Systems, Magnum 350 Pro Canister Filter (half carbon), CPR Bak Pak 2R skimmer, Maxijet 1200 Powerhead, RenaCal 150 W heater, Compact fluorescent lights with moonlights. 40 lbs of liverock, 3" sand bed.
Software:2 Tank-Raised Ocellaris Clowns, 1 Purple Firefish, 1 Electric Orange hermit crab, 18 Blue Legged hermit crabs, 8 or so Nassarius snails, Xenia, Blue, green, and Green Striped Mushrooms.
Click here to vote for AquariumAdvice.com: The friendliest, fishiest place on the net!
Central Illinois Marane Aquarist (CIMA) member.
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08-28-2004, 07:01 PM
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#12
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AA Team Emeritus
Join Date: Mar 2004
Posts: 5,833
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$42.95 at http://www.premiumaquatics.com/
Thats where I got mine, Works great.
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08-28-2004, 08:24 PM
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#13
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Aquarium Advice Addict
Join Date: May 2004
Location: UK
Posts: 2,468
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Yeah I was gonna say.... they are very affordable these days.
__________________
My wife and I were happy for twenty years. Then we met.
- Rodney Dangerfield.
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