This is a plus and a negative?!?!? for my sleeper gobie(valencia strigata) I used to put a little food right under the surface of the sand with either a turkey baster or push small amouts of food or a small piece of diff. frozen foods and let them thaw under the surface. It seemed to work preet good for my gobie and the snails and the starfish loved it too. Now the bad. Any uneaten food will spoil, you have a pretty large system, so it's up to you??? But i also have brisel worms who can find any thing!!! If you decide to do this place it in a high traffic area, this will help the food be consumed