Thin Fish

[Coralgurl]

Been watching my fish over the past while and noticing a couple are getting thin. I typically feed a mix of frozen food, occasionally pellets and nori.

No, I'm not a newb but this is the first time I'm seeing this happen. All the fish are aggressive eaters and no one seems to go without. I watch the ones that seem a bit thin and they are all eating. How do I get these guys to fatten back up? Ones I'm concerned about is an anthia, lubbocks wrasse and my sailfin tang. The others are all fat and look great. No diseases that I can see.

For frozen, I mix cyclopeeze, Mysis, Pacifica Plankton and occasionally others (no brine) just to mix things up for them. I generally feed once per day, in the evenings as they aren't all up when I leave for work in the mornings.

I drop food until they are no longer hanging around at the surface, seems that's about the time they lose interest or have had enough, plus there's food in the water column.

Should I add an auto feeder for pellets during the day and frozen at night?