Originally Posted by mollies
Ok its ben a couple day now, my tank is still foggy iv only lost one mollie. The rest of the fish are fine. Is there anything else it could be?
I'm going to start with a summary just to be sure I and others are on top of what's occuring; correct me if anything that follows is in error.
The tank is a 55g brackish water and has been running 3.5 months, This tank houses 7 mollies, 1 pleco, 2 archerfish, 4 tetras and 2 clown loaches--I ascertained this from earlier posts in another thread, so correct me if this is a different tank. Your ammonia and nitrite readings are 0 (still). pH is 7.6 and reasonably steady (not fluctuating around).
The "cloudiness" is whitish, something different from the brownish tint you've mentioned which we assume is from the wood and will in time dissipate. So we're considering the cloudiness that only appeared recently and right after you changed part of the filter and added 3 mollies and did a 50% water change.
How much wood is in this tank, and for how long? Was the molly that died one of the new three? How thick is the cludiness--does it look like a fog that partly obscures the back of the tank, or is it just a light haze that looked at right up at the glass can be seen to be floating particles?
I'm still inclined to think this is resulting from the filter cleaning/adding fish/water change; I've had some cloudiness after filter cleanings, sometimes for several days. But others may think of something else, so could you just confirm the above and answer the questions, before we go further.
[By the way, the tetras should never be in brackish water, what type are they?]