For some context, I'm planning on keeping a harem of macropharyngodon meleagris in my 120 4 ft tank, I'm thinking I'm going to keep 4 but is 5 possible, my sandbed is 2 1/2 inches deep and I'm also planning on keeping a pair of bluethroats and a margined coralfish, so far there are no fish in the tank, but it is 6 months old and it's time to add some (of course not the wrasses or butterfly) I'm already set on this stock list so don't try to convince me to not get certain species, I think 4 is all i could do but I want to be sure. (This is a question for you @i cant think)