02-11-2009, 06:44 PM
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The answer is... kind of.
In saltwater tanks you do not want a biofilter of any type. Biological filters introduce Nitrate into the aquarium, which we need to keep extremely low. As a result, adding a biological filter to a marine aquarium with sufficient live rock will not improve water quality, it will degrade water quality.
The live rock will serve as all the biological filtration that is necessary for a marine aquarium. You fail to mention the tank size, but given the bioload you have named I hope you have at least a 29 gallon tank. These fish should fit comfortably into this setup, and with 20 - 30 pounds of live rock you will be in good shape.
If this were my tank, i would use the HOB filter for water movement and activated carbon use only. The activated carbon will help to remove organic waste, similar to a protein skimmer, although not nearly as effective. Given the fish you have selected, this setup should be fine. If you have any desire to keep fish selections outside of the Damselfish family, then the addition of a protein skimmer needs to be considered a necesity, not a luxury.