my marble catfish is really acting weird. he's normally always hiding during the daylight but he's been just laying in one spot since yesterday and is very pale, has no appetite at all, and normally he has the biggest appetite. and this morning I guess he freaked out and took off straight out the back of the tank through the lid. luckily was in the room and got him back in the tank asap. but what could be the problem with him? none of the other fish are acting Strang and I've never had any issues with him since I've had him the past year and a half.