FinBall Enrichment Feeder: You and the children will love watching your pet fish play with the FinBall! Follow the instructions on the back. Then watch as your fish pushes and plays with the FinBall in order to get the food out. This challenge is what Marine Biologists call enrichment feeding. Which is a great way to appeal to your pets desire for mental stimulation during feeding. For best results, we recommend turning the filter off before use.