I have just introduced a yellow tank to my tank, I undersatnd a 50gal is border line size wise, although because its a corner tank the dimensions means it has a its largest point 5ft with of open swimming space. Its just a juvinile about just under 3" in size so I will see how it goes. What I am wondering about is food, when I feed he gets scared and hides behind the rocks. I have loads of purple spindly alge which I thought he would eat but dosent seem interested and I read that its easy for a tang to starve as they need to graze constantly. Is there anything else I can give him?