I have both a scooter blenny and a mandarin in my 90 gallon tank. However, it is a well established tank and I have an enormus refugium packed to the bursting point with copepods. The scopter eats lots of different foods and enjoys moving around a lot. The mandarin is more attracted to the copepods and must have a plentiful supply as she is getting quite porky!
I also supplement feed with various things like brine shrimp (only once in a while as it isn't real nutricious), arctipods, etc.