I don't have any yet because the largest I have seen was 14" maybe? I have have been looking for a shoal of tats for over a year but no luck. These guys are readily available so I think I might get some. I have 4 150s 3 are 6ft, 525 which is also 6ft, and I'm building a 14 x 5 x 4 plywood. Tank mates in the plywood will include several small cichla sp. (orinocensis, kelberi, etc), A. falcirostris, P. castexi, P. schroederi, P. leopoldi, B. tigrinum. Future stock when I find them would be a shoal (5-7) H. tatuauia, shoal B. cuvieri. Would they be fine in that situation?