rapid gill movement.

[President89]

this is a 55 gallon with an air stone and an aqua clear filter. ... 6 fish
under 2 inches

[Keith J.]

With an airstone and a power filter, oxygen levels should adequate for over
50 two inch fish.

Possibly gill flukes or a chemical pollutant ?

"President89" > wrote in message
...
> this is a 55 gallon with an air stone and an aqua clear filter. ... 6 fish
> under 2 inches