cowfish cautions

[Aquamarina]

[Please provide a list of all fish and the type of filtration you have currently. Do you have a protein skimmer? Is there liverock in the tank, and if so, how much. Any other info you can think of would be helpful. Thanks![/quote]

The following may not be strictly accurate, as I am getting the names from pix on the net. The tank came with:
4 yellow Tangs
1 Picasso trigger
1 Pyjama cardinalfish
1 b/w striped butterfly (this is the largest fish)
1 4-stripe b/w damsel
3 blue/gold damsels (one disappeared in January)
2 ocellaris clowns
1 ? tomato clown (1 stripe)
1 ? maroon clown (2 stripes)
1 blue/green wrasse
2 choc. chip starfish
1 feather duster (eaten and newly grown again)
1 lobster (in a cave, and never seen clearly)

-no live rock, as far as I know, but there is a lot of reddish and grey lava-type rock

-bio-balls in a tower next to the tank for initial filtration
-protein skimmer

I do appreciate your help and interest. Thanks.