I don't currently have a FOWLR although I do think I will turn my 190 into one when I get my 300g set up.
Because these fish are usually fairly messy eater and will snack on inverts etc. I am going to go BB (or rather keep it BB) that way it is much easier to just siphon the cooters off the bottom. It all gets covered in coraline anyway and just makes maintenance way easier.
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