Stocking my new tank, the tank is 6' long, 18" wide, and 2' deep. So far I've added 6 albino cories, 3 up side down cats, 4 polka dot loaches and 4 ottos, The fish range from .5 inch to 1.5 inch in length, can I still add more fish for mid and top water? thanks

I have a couple of other places to try, if I can't find it there, I guess I'll have to hard plumb it.