Coach, a sechi disk is easy to make. I use a white top off a 5 gallon bucket. Poke a hole in the middle of the top. Run a cord through it and tie on just enough weight to get it to sink but not enough to really stretch the cord. Measure the cord where the disk disappears. It's not rocket science and the Pro's USUALLY use professionally built ones. You can also stick your arm in the water and measure at the point where you can't see your fingers. If you get past your armpit, you probably need to fertilize.
It's not about the fish. It's about the pond. Take care of the pond and the fish will be fine. PB subscriber since before it was in color.
Without a sense of urgency, Nothing ever gets done.
Boy, if I say "sic em", you'd better look for something to bite. Sam Shelley Rancher and Farmer Muleshoe Texas 1892-1985 RIP
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