I have a pair of tank raised percula clowns that I have had about a week. One is a total pig and eats anything I put in the tank (freeze dried brine shrimp, chunks of raw shrimp, shrimp pellets, etc.), swims all over, fallows my finger, and all around seems really happy...... the OTHER clown however......seems to have stopped eating......he LOOKS ok (no dull markings, no odd swimming, etc......he seems about 75% as active as the other clown......) but just won't eat.....food will float by, he looks at it, and then goes "ehhhh"leting it float by........this has been going on since last night (yesterday morning he eat a few very small pieces of raw shrimp but I have not SEEN him eat since)..... for reference, the water specs are:
temp = 78.4 degrees
salinity = ~1.022
ammonia = ~0.5ppm (tank is still cycling)
nitrate = ~0 ppm
I check everything twice a day (morning and night) and am changing out about 10% (half a gal) a day just to help buffer the ammonia while the tank cycles........