Hi, so I have been preparing for an attempted L66 breeding set-up, so far I have a 40B, and 2 20L as fry/grow-out tanks. I do not yet have all the equipment, but am on the verge of having it all. I am wondering how many of them I can have in a 40B as a breeding tank and what a good ratio would be? I am also wondering that if a lightly sanded substrate with some driftwood and rocks, as well as some powerbeads for extra flow be a good set-up? Another question I have is what kind of filtration would be ideal? I am thinking about a canister and maybe a sponge filter. If it is a canister I am mainly thinking about an eheim 2217. Thanks in advance 