The Facebook groups have a goodly number of starving tincs being kept in groups (admittedly in smaller tanks). My knee jerk reaction is to say anything above 2 males and 1 female is a bad idea and the trio only viable if you can rehouse the male quickly if it's not working.
BUT, there is also at least one person with a greenhouse of cobalts on facebook keeping like 30 frogs in a floor plan that from pictures 'looks' to be 3 or so times as large. Soooo maybe?? If you decide to go for it I would have a lot of empty tanks and bins standing by to rehouse. My preference is to go with a different species. Auratus can be bold if in a trafficked area and have a quiet call and can handle groups.
I have 4 tincs I'm growing out now for sexing, so this tank will be for them (or a subset) rather than a different species (unless I don't get a pair I suppose).
Interestingly, I had 3 auratus (1.2), but the females were very aggressive to each other. They never dropped weight, but I felt bad for them, so i separated them. Even Auratus can be bad in groups.
And with that I think I have my answer. If keeping a group of auratus in that tank would make me nervous, then the even higher risk of tincs is most likely a no go for me. I'm really not interested in tearing it apart trying to catch a frog or two because of aggression.
I'll continue to think on it, but I suspect that's what I'll do.
I'm hoping more eyes will provide some good discussion.
