If it's a flat opening, you can screw it on and dope the screw heads. If it's tubular, wrap wire tightly around it. It will get an algae buildup, so will have to be periodically cleaned.
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 Grandpa
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