fish getting sick

[Noober]

for some reason my anytime i have a medium size tang in my tank after a while it dies. it just starts looking like crap and gets ich. I feed it food that has veggies and nori mixed in but mabe thats not enough, should I probably get some ulva or some other tang macro's? Thanks

[Bill S]

Have you checked for stray voltage? Do you have a multimeter?

[mathias]

also if its marine ich if you can have no fish in the tank for 2 months I believe and the ich will kill itself as long as there is nothing it can host with...

[mathias]

but of course you can't put the fish that have ich right back in the tank

[msmith619]

Tangs are probably the fish most susceptible to marine ich. Your system will have to be "fish free" for several months for the ich parasite to go away. When you add a new fish, that fish is stressed and becomes very susceptible to catching ich and that may be why your tangs keep getting it and dieing.
Mike