Thanks for the replies. I've only had a small frag and at the time I had sand and it kept getting buried by a clown. when I moved it up on rocks the lighting bleached it out. I have three different types of shrimp and I'm also concerned about them stealing their food. I am familiar with the bottle trick for target feeding.but I now have a deep tank 24" and no sand so getting to things on the bottom of the tank is difficult.