13 tubs sounds like a lot of work for breeding. you do realize you'll be cleaning 13 tubs ever week or two, not to mention cleaning snake tanks. thats alot of work.

i would think about grouping females together and having a "breeding tub" where you can move a female and the male till she gets pregnant. this way you can get away with 4 tubs for females (three in a tub), a tub for males, a breeding tub and a couple maternity tanks. that cuts down on the amount of tub cleaning...