Can anyone help on treatment of my whole tank I am afraid to use Copper due to Fleming Angel, just lost my sunset Butterfly but no visible ick but stopped eating and was hiding in rocks came out to eat a little and then will disappear, finally not coming out at all if so stopped eating. So I need to treat the whole tank starting with MetroPlex today, Any suggestions all the rest of my fish is eating great except Fleming Angel never got it to eat but eats algae on back of aquarium glass, been doing this for about 8 days and seems healthy, occasionally will pick on rocks and bottom of tank.