Copper is the only med that really works, use cupramine. Treat for a minimum of 30 days after last sign of infection, white spot(s). Treat in a bare bottom qt without rocks. Use plastic pipes or other plastic hiding areas for the fish. You need a biological filtration of course, hopefully you have a large sponge you can move from your dt to your qt. If any little creatures in the sponge, you will have a die off from the copper so watch your ammonia. Get a seachem ammonia alert that you stick on the inside of your qt. Use your tank water to make up your qt water initially. Follow the directions on the cupramine bottle for dosage. As you do water changes to slowly lower your salinity down to 1.018, already have the med in the new water so you don't drop the dosage. So, for example, you remove 5 gallons of tank water, replenish with 5 gallons of new water that has the 0.50 concentration of med in it. Top off evaporated water with pure water and no med in it. Feed garlic. Leave your dt fishless for at least 45 to 60 days. You can move all your sand, rocks, coral, etc, minus the fish into your upgraded tank and start the timer. Max temp boost in the dt and qt to 80. Any higher and the parasite has been shown to go dormant and when the temp drops, goes active again. As long as your qt fish keep eating during treatment and you don't stress them out (enough hiding places, good water quality), they will make it. No carbon or poly filters during treatment, but you can skim. I have gone through numerous ich outbreaks in the past and this is the only method that has worked for me. Gl.
