This Fish Mate P21 Pond Fish Feeder is ideal for ponds and large aquariums. It will dispense food slowly over a 5 hour period so your fish can eat as they do in the wild, over a period of time. This keeps fish active and reduces the danger of overfeeding. Automatic Daily Feeding; Suitable for all Foods; Adjustable Feed Quantity and Timing; Feeds between 8 meals for large ponds to 40 meals for small aquariums.