GOOD HELPER - The fish will eat in their own "bowls". Suction cup suspension, floating design can float with the water level, it helps fish to develop the habit of eating in a fixed position and reduces the waste of fish food. KEEP YOUR AQUARIUM CLEAN - The fish feeding rings keep the food in a certain area, it inhibits the food from floating into unwanted places such as the filter, which allows more of it to be eaten. That does wonders to reduce waste and maintain water quality. ENCOURAGES PICKY EATERS TO EAT MORE - If one ring is filled with food the fish will dash right over there, leaving the second ring open to drop specialty food in for those picky eaters. PREVENTS FISH FROM BEING BULLIES - Bullies can't hog all the rings, so everyone gets a chance to eat in peace. Fill one square fish feeder and allow your more aggressive fish to dash over to eat. Once they are occupied, add floating fish food to a second feeding square for the more timid fish. SAFE FOR FISH - Made of premium plastic, EVA and rubber, non-toxic and odorless, No pollution to water, safe for all aquatic pets. The Floating Fish Feeding rings can help fish develop a habit of eating in a fixed position.