Flashing Fish.

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What size is the tank? tank mates? how long has it been set up? water parameters (ammonia, nitrite, nitrate, ph, temp)? Anything new added recently (livestock, plants, decor)? How long have you had them? Any other symptoms? The answers to these questions will help us help you.
 
Tank is 180.. Checked all levels of parameters, everything very good.. Just have river rocks and crushed coral.. No plants.. A lot of air.. 6 WC zaire frontosa.. Had them for about or 4 weeks.. Tank has already been preped months before with other fish... 2 of the 6 fish shake in spirits..
 
When you say shake, can you describe this a bit better? In the title you said flashing, this is when a fish quickly scratches or rubs against the substrate, rock or whatever else is in the tank. Shaking sounds like it could be something totally different, which might have something to do with mating. Can you be more descriptive?
 
My mistake.. I thuoght flashing is shaking.. Basically.. The fish will swim.. And do a little shake.. Then couple min later.. It will shake again.. More shaking the back of its body.. Like when a dog gets out the pool..
 
its said that they don't shake for mating but it is possible that this is what is happening. If the fish is eating well, and the conditions are good, i wouldn't worry about it all that much.
 
I just checked all the levels.. Any everything is 0.. And ph is 8.0. The fish are starting to breath heavy.. But theres So much O2 running in there.. Maybe when I did the water change I took out too much?

Should I take out 10% of water and fill it back with water from my 90 gallon?
 
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