HI so I'm turning my 75 gallon aquarium into a river/ stream tank. Currently the planned stocking is hillstream loachs, White cloud mountain minnows, zebra danios, rainbow, candy and green dartes. Scape will be some drift wood lots of river rocks. Some vallisneria with root tabs and a sand substrate. Is there any other fish I can add to the mix to make things more interesting. Maybe a larger peaceful fish that can be alone and won't bother the other fish?