11-09-2008, 07:37 AM
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The DogFace Puffer is a sturdy fish that lives well in captivity, provided you give it space to grow and lots of care. The biggest problem with this fish is its massive size. I would suggest a minimum tank size of 220 gallons. Additionally, their teeth grow non-stop and require special care. Many hobbyists actually provide dental care for this fish.
As to the goatfish, I think you are attempting to use a freshwater theory and apply it to a saltwater aquarium. The idea of bottom feeder in a saltwater aquarium is simply not necessary.
Most "waste" in saltwater is in the form of disolved organics in the water column. These organics do not settle on the bottom of the aquarium, but rather remain suspended until they are removed by the protein skimmer or become processed biologically. This can be visibly seen when looking at the amount of waste that accumulates in the protein skimmer daily, as compared to the minimal amount that builds up on the filter pads of your mechanical filter.
Some waste will naturally settle, such as decaying algae, foods, and solid fish waste, but this is minimal. It is even more unlikely in a fish only system, which when set up properly will have very strong mechanical filtration. The density of saltwater is very effective at keeping larger particles suspended in the water column until removed by the mechanical filter.
This concept can be disucussed in much further detail. In fact, this may be the biggest difference in freshwater theory vs. saltwater theory. In freshwater systems, the bottom feeders "eat" the waste, but in a closed system this waste is simply recycled back into the aquarium. In contrast, the protein skimmer on a saltwater system will actually remove the organic waste from the water. It is not biologically processed, and is not recycled into the water column.