i think u got a midas blenny and not a goby, anyway most blennys should be compatable with cardinals here is some info
Midas Blenny Maldives
(Ecsenius midas)
Size Up to 4 inches
Venomous No
Origin Indo-Pacific
Diet Herbivore
Manners Peaceful
Effort Level Easy
Reef Compatible With cautionTank
SG 1.020-1.025
pH 8.1-8.4
Temp. 72-78F
I am mostly orange with some blue under my chin. I would be glad to go to work in your 20-gallon or larger aquarium. Unlike most blennies, I will want to eat small meaty items as well as graze on microalgae growing fresh in your tank. My other request is for something to perch on and watch you. So that you are aware, I may bite or nip at stony corals, clams, or other fish that look like me. For more detailed information,Purchase the Burgess Atlas
here is a pic on this page look under the blenny section and it has a midas blenny there
midas blenny
this should give you a start anyway
![Big Grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
[ December 24, 2001: Message edited by: karlas ]