Hi all, i was thinking about adding some new fish to my 300 gallon tank. The tank measures 6 foot long 3 foot wide and 30 inches deep. My current fish include: 12" albino oscar, 10" leporinus, 8" nicarogwanies, 3" jack dempsy (must be a runt has been this size for 5 years) two 3" silver dollars...