My experience is only with Haddonis, so keep that in mind.
If you have another tank that you could move it too, a 33 cube would be the smallest to start with. If not, a 40 breeder would be the min, though would think a 58/65 would be better.
My 33 cube has a Haddoni in it (( and a pair of clowns )) and it is taking up pretty much the whole tank.
And besides size, Haddonis will produce a decent amount of waste that will have to be dealt with.