To be honest, you hardly have any fish. And as far as bio load, I normally as a rule of thumb don't count inverts as "fish" in terms of the load they would put on the biological filtration. I say this because they are scavengers. you don't normally feed them, they feed off the others in the tank and what they don't eat.
In your size tank I would try to stick to some of the smaller pygmy angels, or as other have suggested, wrasses, etc.