Fish Swimming Around Top Of Tank

[maverick08]

Im starting to worry that my fish are swimming to the top of the tank and spending a lot of time there and also around the filter. Ive also saw some sitting on bottom and on the plants. Is there a reason for this and can someone advise me of the perfect way to fix this problem. My tank has just recovered from a devastating white spot problem where i lost 6 fish. Help, I dont want to lose anymore. Cheers

 

[fishlover500]

What size tank, how many of what fish do you have in it? Some fish just always sit on the bottom while others naturally like the top.

 

[maverick08]

What size tank, how many of what fish do you have in it? Some fish just always sit on the bottom while others naturally like the top.

its a 90 ltr tank and ive got 10 fish, all prety small. its my 2 black mollies that do all the floating

 

[three-fingers]

For the fish at the top and near the filter it sounds a bit like oxygen deprivation.

What temperature is your heater set to? Or more importantly, what does your thermometer say?

Also, what about water stats?

To be safe, may as well do some big water changes, usually the correct course of action for most bad situations.

 

[Legend]

Yea I am with three fingers what does your thermometer say?