I've bought tank-raised ocellaris and tank-raised maroons, and they are all very hardy. That is one thing I would recommend people consider buying from Petco, their tank-raised clownfish. I wouldn't worry about the cyano myself. That is more a result of low water flow and excess nutrients. It would be present in any tank with the right conditions and absent in any tank with the corrected conditions. I suggest you stay away from wild-caught clowns. They often harbor parasites and are much less hardy. Also, supporting tank-breeding is a good thing, in my opinion. Are you sure they are true percs? I would think for $15 you are getting tank-bred ocellaris. Whatever the case, ocellaris are great pets. I have a pair of ocellaris and an individual wild-caught true percula (I couldn't find any tank-bred true percs at the lfs here or I would have bought one), they're all great and equally full of personality. My tank-bred ocellaris are prettier though, with a much deeper orange.