sg went down with introduction of rock, normal? w/pic - Aquarium Advice

napydred · 09-24-2006, 12:20 AM

Hey, I cycled my ten gallon tank for a month or more with a coctail shrimp. yesterday i bought 3 lbs of live rock and four blue leg crabs, the crabs devoured what was left of shrimp and seem to be happy. when i added the rock and all, my salt gravity went from 1.023 down to 1.020, should i be concerned with this drop? thanks in advance for replies.

**Devilishturtles** · 09-24-2006, 01:55 AM

Are you using a hydrometer to measure? Could be fault in that. Also check for a mini cycle. SG flucuates during the cycle, normally.

napydred · 09-24-2006, 10:53 AM

i am using a hydrometer, it is attatched inside the tank so it monitors the sg continuously, maybe the sg could have dropped a little due to the displacement of the water level caused by the rock?

**lando** · 09-24-2006, 11:30 AM

the accuracy of most hydrometers is suspect. Take a sample to the LFS for verification. I can not think of any reason that the addition of LR would lower SG. Nice looking chunk of rock, BTW

**roka64** · 09-25-2006, 10:33 AM

I agree, take it to your LFS to confirm your readings.

09-24-2006, 12:20 AM	#1
napydred Aquarium Advice Apprentice Join Date: Jul 2006 Location: GA Posts: 45	sg went down with introduction of rock, normal? w/pic Hey, I cycled my ten gallon tank for a month or more with a coctail shrimp. yesterday i bought 3 lbs of live rock and four blue leg crabs, the crabs devoured what was left of shrimp and seem to be happy. when i added the rock and all, my salt gravity went from 1.023 down to 1.020, should i be concerned with this drop? thanks in advance for replies.

09-24-2006, 11:30 AM	#4
lando Aquarium Advice Addict Community Moderator Join Date: Mar 2004 Location: Savage, MN Posts: 7,669 Images: 46	the accuracy of most hydrometers is suspect. Take a sample to the LFS for verification. I can not think of any reason that the addition of LR would lower SG. Nice looking chunk of rock, BTW __________________ Some people are like slinkies...they serve no real purpose yet can still bring a smile to your face when you push them down the stairs! Have a great day! Brian

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09-24-2006, 10:53 AM	#3
napydred Aquarium Advice Apprentice Join Date: Jul 2006 Location: GA Posts: 45	i am using a hydrometer, it is attatched inside the tank so it monitors the sg continuously, maybe the sg could have dropped a little due to the displacement of the water level caused by the rock?