I established the goldfish in their tank first. They were there for four of five weeks before I got around to making the grow bed. The bed is a simple flood and drain set-up with about 3 1/2 inches of expanded clay pellets. The bed is lined with poly. I had some issues with leaks because I was trying to use silicone to seal the overflow pipe to the poly. The silicone didn't really want to…
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