Rowly, I started trying to feed fish this year and was not having any luck. I made a manuel feeder using 4" pvc, 5' long, drilled 1/4" holes up 4 sides about 2" apart, capped one end of 4" pipe and put a screw in plug on the other end.
Just below the screw in plug, I drilled a bigger hole to tie a rope through so that I could tie it to my dock. This feeder didn't need filled but about once every 7-10 days at first, then it was every 3-4 days , then it was every other day and now it's everyday. I started throwing out a few pieces of old bread and made me a feeder ring out of some 1" pvc. Now I have perch feeding like crazy at my dock. All of this was very low cost.
And I am very happy with all the results.