Hi, I actually have one of these, there was a lone on the the LFS for a few months and I eventually brought it home with me. I have had it for 7/8 months now and it hasn't grown at all so I can assume it is fully grown at 2". It is quite a timid little fish and lived happily with my 6 Lamprologus Ornatipinnis for a few months with no agression but afer it had settled in and re-grown its shredded fins I moved it to my other tang tank and it now lives happily alongside 2 x Neolamprologus splendens, Eretmodus cyanostictus, Telmatochromis temporalis "shell" and Julidochromis transcriptus. It is managing to hold its own though and enthusiactically defends its shells from the Telmatochromis. They are a great little fish and if you can get hold of any I would highly recommend them.