I have a 55gal and bought 3 yellow tangs a month ago and they're doing great. I was told by a fellow MR member that my tank was too small. That I should atleast have a 125gal for my new buddies. They are only 2 1/2 in. right now. Figured I would move them to a bigger tank when they get bigger... Is it dangerous to keep them in my tank of 55gal for now???