The one part of my frag tank setup I had the biggest problem with was getting the flow right. I knew I needed a lot of flow to keep the newly cut frags flushed clean to facilitate healing. Although I did not want to blow the frags out of the eggcrating. I opted to use one of the Tunze nano streams to get a decent wide and powerful, but gentle flow. It is easily pointed to adjust flow because of it's spherical shape. By the way, my frag tank is 33 gallons (34.75"Lx16.875"Wx13"H). Several of those out there producing frags on a regular basis use SCWD's (Switching Current Water Director) to double the output of a return closed loop pump for cheap. The original SCWD has 3/4" barb fittings, but the new SCWD had 1" threaded connections and a removable top for easy cleaning unlike the original 3/4" model. My last recommendation is to have a bare bottom frag tank. This makes it easy to clean the bottom of detritus and uneaten food... yes uneaten food, more info on that in another post. To still have a sand bed, set one up in your sump or refugium. Please post your comments and questions you might have about your current or future frag tank.