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Old 08-26-2004, 08:41 PM   #1
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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?
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Old 08-26-2004, 09:01 PM   #2
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You trust a refractometer
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Old 08-26-2004, 09:04 PM   #3
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thanks for the help.
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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.

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Old 08-26-2004, 09:21 PM   #4
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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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Old 08-26-2004, 09:29 PM   #5
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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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Old 08-27-2004, 02:20 AM   #6
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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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Old 08-27-2004, 03:50 AM   #7
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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.
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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 |
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Old 08-27-2004, 03:51 AM   #8
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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.
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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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Old 08-28-2004, 05:03 PM   #9
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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?
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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.

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Old 08-28-2004, 05:15 PM   #10
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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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