Sounds weird but if it looks healthy it normally is. For fuzzies look for a good appetite, strong colour, active and interactive fish. They can become real pets and beg for food so just make sure you are feeding the right varied diet and not overfeeding, plus keep on top of nutrient levels in the tank and it should do fine.
He seems to be eating well, he eats live mostly some frozen, he is active at times but most of the time he chills on the back wall or on the rock, the Lfs said he was a fuzzy dwarf so I guessed it was not clued up on Lionfish.