slief
RC Sponsor
You actually have a eel in there, huh? Never noticed it before.
I believe that's an engineer goby. The only reason you can see it is because there is no substrate, otherwise it would disappear under the rockwork and you'd be unsure if it even existed.
Dave.M
Dave is correct. They are Engineer Goby's. I've got two that are about 12" long and two smaller 6" ones. They are model citizens but tend to hide except when it's feeding time. They are pretty cool though. One of the fish that when you are looking around the tank, they pop out of the rocks and for somebody that hasn't seen them or the tank, it's a surprise seeing fishing staring out of the rocks. Especially when most of the other fish are in your face and follow you around the tank. What I like the most about them is that they remind me of a Tessalata eel which is my second favorite eel next to the Hawaiian Dragon eel.
I've had the one you see for a few years now. He was my sole surviving fish after my bleach disaster last year.