Have you tried the LRS Nano Frenzy? My clowns were a bit picky at first but ate at the store, never EVER buy fish unless you see them eat at the LFS. Trustworthy places will feed a specific fish/tank on request. They took about a week to start eating properly, I believe this was due to them being in separate tanks at the lfs (one was Picasso and the other a snowflake) and the sameish size, so they were fighting for dominance. They just barely picked at it for a while then the slightly bigger one became dominant and they both began eating with vigor as they had at the lfs. Patience, and maybe try feeding a variety of foods at the same time (crushed pellets, pellets, flake, brine, LRS) to get a lot of scent in the water. Also, I feed the LRS without thawing, just rubbing it between my fingers underwater near the surface, I believe that this helps them locate the food source, and allows for a slower release in a smaller area so they can get more and the tiny particles the baby clowns like to eat are not lost by the powerheads (turn them off, you may not need to turn the filter off though)