08-06-2009, 08:08 PM
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I have not kept BGKs, so I will not advice.
Dragon gobys are brackish fish,they will live short term in fresh water, but are susceptible to many diseases if kept in fresh water for to long term.
I keep my dragon goby in brackish water of .005, you will need a hydrometer or refractometer to test salt levels.
Dragon gobies will do well on a diet of bloodworms, blackworms, shrimp, algae wafers, and snail jello.
I don't think you would be able to keep the BGK and the Dragon goby together long term, but there are other brackish fish that would do well with the dragon goby in that size tank.