I've been "taming" the siamese algae Eater so it's not extremely scared of human interaction... He's getting better definitely. He comes out more and stays out at times when I'm here, but he still goes into hiding if I get too close or anything. It used to be anytime I came into the room, but he's getting braver.
I hope this is aimed at returning it? One reason it is so bashful is it is under stress from being on its own, a shoaling fish. And it will get too large for comfort in this tank with your other fish.