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Old 08-22-2008, 02:43 AM   #11
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A 3 week tank is to soon for any stock. And a canister for water movement wont cut it. Salt water recieves oxygen from a gas exchange at the surface and the better water flow in the tank the better oxygen level. And not from pointing the powerheads at the surface. You want powerheads rated for atleast 15 times exchange. Or your tank size time 15 would equal amount of GPH from pwerheads minimum.

Heavy breathing fish mean low oxygen.
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Old 08-22-2008, 12:00 PM   #12
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Quote:
Originally Posted by lance View Post
A 3 week tank is to soon for any stock. And a canister for water movement wont cut it. Salt water recieves oxygen from a gas exchange at the surface and the better water flow in the tank the better oxygen level. And not from pointing the powerheads at the surface. You want powerheads rated for atleast 15 times exchange. Or your tank size time 15 would equal amount of GPH from pwerheads minimum.

Heavy breathing fish mean low oxygen.
The OP said...

Quote:
My tank is 6 months old...
The new fish being added are only living for 3 weeks. Seems like if it was an oxygen issue, then ALL fish would be dead - but that's not the case.
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Old 08-22-2008, 12:16 PM   #13
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Yeah, my other fish are fine and I have 2 powerheads pointed at the surface and then the canister moving water near the surface as well. But the powerheads are plenty big enough for the tank size as I learned what to purchase there from reading all these great posts!
My fish never hover near the top unless it is feeding time. Or of course if I stand there just to observe and they start begging.
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Old 08-22-2008, 01:50 PM   #14
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I don't have much time, but do you quarantine? Have you asked the lfs' to see what medications they use on their fish and which ones they keep in constant circulation? Your temperature and salinity are fine, but do try and regulate the temp. a little more with a fan. Are the fish intact when you find them? How are the other fish reacting (breathing, behaviors, etc). when one is dieing? Have you tested the water parameters early in the am, around 3-4am for significant changes (DO, pH, etc.)? Does the cat pursue your animals or have you checked in early am for a predator (internal)?
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