11-25-2009, 06:16 PM
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When I think of a gently stocked system, I am thinking more about the types of fish than the numbers. Assuming you stock the tank properly with smaller sized fish, such as Centropyge angelfish (or smaller sized) species, then the number of fish will not determine your system. Actually, territory and aggression will limit your fish selections, and you will be able to tell from visual observation of your tank when this occurs. I am guessing 4 or 5 fish at most, depending on species.
In this case, with 40+ pounds of rock and a deep sand bed, the BakPak would be fine. I would personally suggest you upgrade to a better skimmer. If you have a budget, I can recommend a skimmer.