Nitrite levels

[ukcats]

Just how many fish did you have in there? That could be the problem. How old is the tank? Did you over load it by chance?

 

[bernabei]

Had 7 small(3/4 to1") damsels, 1 tang, 1 mandrine gobi, 2 small clowns, 1 flame angle. 1 starfish, My tank is about 4 mos. old.

 

[ukcats]

Too many fish... too fast...I would say. You overloaded your biological filter. Get more fish, but get them slower. And not as many.