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At one time I was considering this and then came to my senses....lol
I was going to get a large bin to fit the sump and tape insulation to the outside. Or make something to place sump in.
I didn't do this because its a 1 car garage and my car would not fit.
My plan is use a syringe with peroxide and inject the tubes with it. Then crush the tubes, cover area in glue and rinse. I knew will always have a few but not they are popping through coral.
The powerheads are not mine; knock wood so far they are clean.
One rock has no coral the other does. Will soak the one in vinegar and manually remove and glue the other. I cannot get all the rock out to manually remove.