I dont think anything bigger than 100+ gal tank would be sufficient enough for 2 RBs to have alot of space and find each other to pair off comfortably. But once you do have a pair, you can easily house them in a smaller but spacier tank to breed again and again with no prob.
Spawns have occured in 55 gallon tanks, I don't believe space to be the major issue, tank conditions are probably the most important factor. There is also no guarantee that the mated pair will continue to produce once you move them, there is a higher chance of them mating again but it's not 100% (then again what is).
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