Ok so I notice ich/ick on my blue tang and lieutenant tang out of all my fish (12) in my 40 gal one day. Little worried I go to Lfs and grab garlic and kick-ich. I take out charcoal, and turn off skimmer. Feed tank 1 block mysis shrimp thawed and with 2 drops of garlic and a 2"x3" piece of seaweed with 2 drops of garlic rubbed in. Dose tank for 4oz of kick-ich(2oz per 25gallons). So next day I wake up and all gone! Stoked but aware it's probably still in substrate I keep dosing and feeding plenty of greens and garlic(not exceedingly). And 2-3 days later it's back. I keep doing doses every other day as bottle directed. Then next day Blue tang Back to health but lieutenant tang isn't doing so well. Next day he is doing horrible and breathing heavy with white spots everywhere on him and flakey skin. The following morning it dies. Everything else seems to not have any physical signs of ich at the moment but not sure what to do.