Well out of all the ones that I had I have two that survived. They are getting really big and eat everything except flake/pellets....they gobble up mysis and frozen food. They are still in my sump/fuge and swim darn fast so I haven't been able to catch these two. They are probably the size of a nickle or quarter......hard to tell. I am reluctant to try to catch them as the I had caught 4 a few weeks ago and put them in my 20......they were dime sized and I thought they would be fine......There is a secretive wrasse living in that tank that within a blink of an eye gobbled up all four......I was extremely upset and couldn't believe a fish with that small of a mouth ate something almost half it's size. Oh, and one went through the protein skimmer.......not a pleasant day.......so hence I am not willing to move these last two until they are much bigger and able to fend for themselves....