I have an Engineer Goby too. I love mine, he is the coolest fish. It changes color from black and white to black and yellow greenish stripes as an adult. He digs a bit but once he gets settled it will taper down quite a bit. Mine is about 10 inches long. A lot bigger that the 6 inches I heard they get.
Anyway, what I did was buy 2 or three sticks of putty and just started puttying whatever looked like it might be in jeopardy. I also reinforced some of the rock work below gravel level. It's a really cool fish if your willing to do a little gluing up.
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