My new rescue betta fish is in a 7 gal heated tank that I used established filter media with. At first he was swimming around happily investigating his surroundings and what not. But I put a little cave in there so he could have some privacy if he wanted and the only problem is ever since I put it in there he has only come out like 4 times and he always hides in there during the day. He hasn’t been eating and the only times I could get him to eat was a few blood worms and that was three days ago and I tested the water it was all good so idk maybe he’s just a shy fish? I’ve had him for a week and a half I’ve only seen him eat 2 times maybe he’s just not a hungry guy???