I have 3 BTA's, spotted Mandarin, yellow watchman, red-head goby and 2 perc (Orange) and 1 oc (black) clown(s). I did have a black clown goby disappear but I don't think that dude ever acclimated, prolly ended up crab chowder. Tank is 135g, so, they all have their choice of where to hang out, but, I would think the gobys would avoid instant death via animal instinct. GL!