I had my 6L in a 30g with my bi-colour blenny (bi-colour was there 1st) and they got along great. When we sold the 30g we moved them into my 230g (mostly tangs and angels in this tank) and my 6L hid for awhile. Now he is comfortable enough to swim around (doesn't bother anyone) and he actually swims around with my bi-colour a lot, I guess you could say they're best buds
