For 4 more RTC's? I'd get 2x220g tanks to grow them out a bit. That's absolute minimum lol. You're going to need a couple ponds to house these fish...That big one will be way too far ahead of the other 4 to house them in December.
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i am growing my 2 tsnxrtc in a 60 then to a 125 then 220 and im putting a pond in my basement for the 4 i got. so if you have a 75 it will last the little guys some time your best bet is to build the pond asap because thay grow fast put the big ones in the pond and then put the little guys in your bigger tank till thay get big enuf that thay are not seen as food it will save you $ in the long run and you wont have thousends in tanks laying around the house trying to figer out what your going to do with them lol
They will so get eaten. My friends RTC ate about 80$ worth of fish he figured out what was going on when he saw two four line cat tails sticking out of its mouth... Ended up saving the four lines though