Yea i think i agree with you, the little monster is 3 inches now but i figured a 3 inch RTC will give him a run for the money lol. Plus i heard that a full-grown juruense only gets 24".
check my thread in indoor ponds, i have a rtc, rtc x tsn, tsn, pangisius, about to pick up a giraffe cat from another member. when youre dealing with a pond you can go with a few so long as you have enough room to make a large pond. where in iowa are you? aqualand pets plus in des moines sometimes has a single rtc in stock, or could get one for you.