I biught a sohal tang 1 week ago, about 4". I tried feeding, pellet, flake, But he would not eat. I took some untoased norri home from work & he is eating like a champ. But how much should he eat. as soon as its all gone he is lookig for more. Is this normal, and if so, What kind of impact does all the flying seaweed have on the water param, if any???