How many Gobies and Blennies in a 75g?

[Darsh85]

Most of these guys can't mix unless they're mated pairs but is there any rule regarding different species mixing in the same tank?
Its a 75g 48"x24"x16".
Thanks.

 

[Monkeyfish]

I think it depends on the species. I kept a tail-spot blennie, yellow-head jawfish and a pair of firefish gobies without difficulty in a 75g.

 

[Darsh85]

Yeah what I would really like is one of as many species as possible without them feeling the need to fight. Like having some who sift sand, some who will feed on the food I give them and some algae eaters. Just a nice selection.