I would personally recommend a lesser fish load when planning a system. Like something closer to twice that amount of gravel bed per pound of fish. Once experienced you may be able to get away with more fish but if you are having to ask how much fish you can stock, you are really not prepared to handle a system stocked that heavily. One fish per cubic foot of gravel (aprox 7.5 gallons of gravel bed) is a very reasonable amount to start with.