REPLACE THE TRADITIONAL HOB, CANISTER FILTERS — Gone are the days when you got to change the cartridges and filter media almost every week. The handy filter by will do the same job economically and quickly.^ SPECIALLY DESIGNED FOR , FRY & OTHER SMALL AQUATIC PETS — Betta, fry and other small fish will NEVER get stuck up into the filter. These fish, especially Betta, generally don’t like vigorous currents, they prefer calm and steady water. This filter is designed to have slow current to easily let betta, goldfish discus, dwarf cichlids, guppies, and krill fish, continue breeding and spawning comfortably.^ PROVIDE SUPPLEMENTAL FOOD FOR FRY — The minor bubbles that are created by this sponge filter creates a nominal current, adding in bubbling water. This will encourage them to continue breeding and spawning comfortably. Also, the sponge filter makes a home for fish food supplementing their daily dose of diet or food intake.^ PERFECT FOR UP TO 10.5 GALLON TANK WHEN USED SINGLY