I have a 46 gallon bow front with 8 Longfin Zebra Danios, 2 dwarf gouramis, 2 cories, 3 ottos, 4 serpae tetras, 2 longfin blackskirt tetras, and 5 bloodfin tetras. Is that overstocked or could I maybe add a few more fish? Originally there were 10 neons instead of the danios but they all died. 