I've seen engineer gobies 2' in length. The filtration in your 10 gallon scares me. I am running a total of 450gph of HOB filtration and I have 10 lbs of live rock to help with the biological filtration. If I were you, I'd get much more live rock for your tank, then I would invest in a HOB filter such as a penguin 350 or something strong. Then if you felt you just had to have something else for the tank, get a shrimp. Also, what kind of lighting are you using?
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