Sounds like it could be a yellow watchman goby. Try googling that and see if the pics match what you have.
Here's a pic: Saltwater Aquarium Fish for Marine Aquariums: Yellow Watchman Goby
_________
38 Gallon (restarted 6-14-08 ). 30lbs LR, 40lbs LS, 10g sump/fuge with Caulerpa and Mangroves, Current 4x39w T5HO lighting, 2 Koralia #1, AquaC Remora. 2 small colonies of polyps, Cleanup crew (50 Dwarf Ceriths, 16 Florida Ceriths, 10 Nassarius Vibex, 14 Blue-leg Hermits, 1 Limpet).
20 Gallon. 15lbs LR, 20lbs Crushed Coral (replacing with LS), 65w Current PC lighting, SeaClone 100 (replacing with a Remora), Skilter 250, 2 Powersweep 212's.
Last edited by Reeron; 07-10-2008 at 06:15 AM.
| 
Cannot Identify this fish 
Anyway, it seems to be a pretty cool fish, about 2 1/2"L all bright yellow with a small blue dot on its head. It resembles a midas and or canary blenny but definitely is not one of them. It seems to move with a whipping tail more like an engineer goby and swims in small strides. It seems to be reef safe as it hasn't picked at any of my corals and eats most food I offer. It does hide out behind live rock sometimes and others it swimming around searching for food in a stop and go motion while staring at the substrate. It definitely is a cool fish to watch but I cannot find ANY information on what this little guy is??? I have searched everywhere and have yet to see anything like this fish - wish I had a picture but I cannot get a decent one because the pics don't do any justice - Please help!! 
