Originally Posted by PBM3000
All things graciously considered, yes I'd rather see 1 or 2 of my 8 R. Amazonica than just two Tincs rattling around a large enclosure like two marbles in a tin.
I'd rather have one thumbnail than a whole bucketful of Tincs. I understand your desire.
I don't have amazonica, but my sirensis don't show themselves at feeding time much, and my vanzolinii aren't much better. Imitators do, but groups are not recommended.
I don't see any problem with eight group-tolerant thumbs in there, but I don't have much experience grouping them (I run most of mine in pairs).