i have a 9 cm blue tang about 5 month. he had white spitting once, but he recovered quickly. i also had naso lituratus for a month and it seemed he is doing well untill suddenly he had something that looked like big white splitting and he died within two days. when i put him out of the aqurium i saw that my blue tang have many white splitting in his fins. i brought him onion and alga and he looks better now but there are few more white spits. what is really worry me is the fact that is tail began to fade, lose color. i dont know what to do. any suggestion?