lol...it is a feeder for my dwarf seahorses...i was going to transfer it back to the dwarf tank but then the snail laid eggs so now it stays,lol. basically what it will be used to is i will put rubble rock and macro algae in there and then it will be a place for pods to live in, and crawl out the small holes where the dwarves can pick em up. little bird feeder for dwarves