Its a new tank and is essentially fish only at this time, right? If that is the case, you can gradually introduce chloroquine phosphate (CP) and that will kill the ich safely and effectively without you having a an ammonia spike. You may want to read up on CP as it is easy on your biological filtration, fish and is very effective. Much better than copper. Simply dose as you will see recommended on many threads. When you start to see algae return to your tank, you know you need to add a maintenance dose. After 90 days, add carbon and do a few water changes to rid yourself of it. Very easy and effective. Here is some background. I've been in the hobby since 2011 and have experienced ich before. On my latest build, started April of 2017, I intentionally started with CP in the display tank because I assumed that at least one fish would bring in ich with it. I have a power blue tang and another dozen fish or so. None required QT using this method. All are ich free. In fact, there are no health issues at all and the tank now has a lots of healthy growing SPS corals from Z's, RR, and JF. My own experimentation proved that it works great. I also dose CP at work where I maintain several medicated commercial tanks. I won't bother with more details for now. Go ahead an read up. If after that you have more questions, let me know.