You're planning on making it a bare bottom tank? Not a bad idear with discus. The only thing I can think of is siphoning the rest of the substrate out with a larger diameter tubing. Something like 1/2 I.d. (About $10 at homedepot). Think of it like using an aquarium vacuum without the chamber.

Other than draining, drying it out with a hair dryer and then vacuuming it. I'm at a loss. Discus, as you know, are way too sensitive to just toss into a temp holding tank and then returning them.


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