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I have a pendulum demand feeder that I got from Aquatic Eco Systems. About the same price. It holds 20 pounds of feed (but they have larger). I got it last year. Its AWSOME. The koi bump a little rod that dangles in the water (it has a ball at the end). And it dumps out pellets. Its very adjustable to get as many or as few pellets with each bump. I was feeding my koi 1 1/2 pounds a day over 4 feedings. After I installed the feeder, they ate 4 pounds a day. I have since reduced my herd from 120 to 83 and this year they are eating about 3 pounds a day. They seem to eat most at night, very little during the day.
I have really noticed much better growth rates, even out of the larger koi. No fat bellys and no overweight koi.
Only downside is now the koi totally ignore me. Throw in pellets and they dont even care. Once I get them all up to monster size, mabye I'll go back to hand feeding and put the demand feeder on the grow-up pond.
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