i've gotten a knight goby on thursday, and put it in my tank a after a dipping it with paraguard for few hours(and it had no visible disease/infection). it immediately made the corner of the tank, with an overhanging small water pump and a tall plant next to it, as its den. the next day, i used garlic guard to attract it to get bloodworms from near the surface with my f8 puffer. all was fine. but the next day(yesterday), it refused to come up no matter how much garlic guard i poured in (i fed clam meat to both yesterday). in the end, i had to dip my entire arm in to reach the bottom of the tank where its den is, and drop the clam meat in front of it. only then it ate the clam. i can see it swimming around the bottom when i see it from far (and my puffer simply stares at it and swims away, no aggression), but when i (or anybody) goes near it, it zooms immediately back to its den. how do i make it warm up to me (or for that matter, humans)?