When figuring out this kind of equation I always figure 1.2 groups.... figuring an average of 8 babies per female per month... This equation works very well considering MANY different factors. So my best guess would be to set up 7 trios... and you will know for sure that you will reach a point where you will consistently have enough feeders every week. Takes time to build it up though with all the grow outs and new breeders and stuff... probably 4 to 6 months or so.
I would also recommend an 8th tank for courting of future breeders. once they are prego, retire the oldest trio of breeders and move the new ones in... then repeat. This will keep your oldest breeders from getting to old.
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