Cloudy water after WC/fish gasping - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 03-06-2008, 06:02 PM Thread Starter
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Cloudy water after WC/fish gasping

hi, i tried looking through old threads about this problem but i couldn't find what i needed. i do weekly 50% water changes in my 55 gallon tank. The past few times the tank is all cloudy the next morning and the fish are gasping at the surface. Last night i replaced the filter floss in my fluval and got some of the extra gunk out after the water change.

The parameters are:
Ammonia 0 ppm
nitrates 0.5 ppm
nitrites 0 ppm
ph 7.0
temp 75 degrees
i dose ferts about 3 x per week/capful of flourish
96 watts/8 hours day
pressurized CO2 - 18 ppm
fluval 305 canister filter with ceramic rings & filter floss

i have 5 red zebra cichlids, 1 SAE, 2 australian rainbows, 2 black mollies in the tank

why does my water turn cloudy the day after a water change and why are my fish gasping at the surface? my best guess is there's not enough O2 in the water but i'm not sure why that would be. a bacterial bloom doesn't seem to make sense here. it's not green water either i checked. thanks for any suggestions.

Last edited by coley24; 03-06-2008 at 08:08 PM.
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post #2 of 6 (permalink) Old 03-06-2008, 07:57 PM
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I have the same problem.

I'm using aquasoil-II. My tap is -highly- saturated with CO2, and is very alkaline due to the water company buffering with phosphates. My tank is on the acidic side. I don't test much ....

I have some theories on why the cloudiness occurs, but no way to prove them without purchasing a r/o unit and doing a lot of chemistry study.

For now I just do 2 water changes a week ~25%... minimal cloudiness

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post #3 of 6 (permalink) Old 03-06-2008, 08:07 PM Thread Starter
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i'm thinking it has something to do with overgassing? do your fish gasp at the surface? the cloudiness clears up after 5-6 hours but i don't like what happens to the fish. i'm thinking of running an air pump over night when i do a wc to see if that helps the oxygen depletion. that's my only guess....

good luck with your tank too!
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post #4 of 6 (permalink) Old 03-06-2008, 08:12 PM
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In my case, I think overgas is just a part of it. The loaches in my tank don't seem to mind. I think is has something to do with the phosphates-aquasoil-alkaline tap interacting with my acidic tank water..unsure how.

You can try aging your water in a seperate container, makes for a PITA water change though :/

I did a 90% water change a few weeks ago and the water wasn't clear again for a week. After the polyphosphates were eaten up? I dunno..

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post #5 of 6 (permalink) Old 03-06-2008, 08:18 PM
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Perhaps turn off your CO2 for a bit before water change.. experiment with that.

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post #6 of 6 (permalink) Old 03-07-2008, 01:23 PM Thread Starter
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i put two airstones in the tank and within a few minutes the fish stopped gasping and the water cleared up by morning. the co2 does go off for about 2 hours before the water change. i guess the problem went away but it killed my SAE in the meantime...
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