After cycling my 125g I bought two yellow headed gobies and a scooter blenny. I lost one goby and now the second one looks mighty skinny. Is there a way to feed them anything?
You say after cycling your tank? How long has it been set-up (before) the addition?
These guys need to eat pods and bugs in your tank and those things need time to grow. IMO your tank can handle two or three of those fish without a problem but you should wait till you have the natural food growing to keep them alive. might consider a refugium if you don't already have one and if not maybe a place to grow them like a rubble pile. I have seen my scooters eat some left over frozen mysis shrimp and tear into a croaked snail but I wouldn't want to rely on it to feed them. I would fo to your LFS and see if they can suck out some good pods to get your started faster...
I agree. These fish will starve unless you supplement their diet. Unfortunately, they are very shy (I assume) and don't like to come out to eat. If you have a turkey baster, try squirting some food near/into their hiding spots on the bottom of the tank. I would try a variety of foods until they eat.