Clown Problems

[yershifish]

I recently got 2 false percs, and they seem to not be doing well. For some reason they never survive for more than a week. I've had clarkiis and tomato clowns before, and they never die, but when I get false percs, they always die. What should I do? I currently have a biocube 29 with 3 damsels, 2 firefish, 1 pj cardinal, 2 false percs, and a cleaner shrimp.
Corals = large colony of gsp and some polyps and a LTA.

 

[slosht]

How many ocellaris do you have in that 29G? 2 or 4? Are they getting harassed by the 3 damsels?

 

[yershifish]

I have 2, I just took out the 3 damsels because one of them is getting too aggressive, but it's weird, everything in my tank seems to be doing fine except for the clowns. I had a tomato clown in there before, and he was doing fine but got too aggressive so I took him back to my lfs and got the two O. Clowns. Do you think it's the quality of the fish?