There is no such thing as a reef safe oxidizing agent that will kill the free stage floating ich and not also devastate other populations of creatures within your tank...
If there was, it would be the same theory as just MASSIVELY dosing hydrogen peroxide (an oxidizing agent) to lethal levels for ich. The issue is, lethal levels for ich are almost guaranteed to be lethal levels for other things you like...
Or more likely, it isn't lethal enough to target ich.
Dig for some reviews from noted members on forums, not individuals posting on sites that sell it. When I had ich that came from not quaranting, I found through my research that there is /zero/ solutions that are reef safe.
Here is a review from a forum member here:
https://www.reef2reef.com/threads/polyp-lab-medic.402092/
You have three options to make your reef and fish ich free. All three start with catching and removing your fish and placing them in seperate QT.
#1: Copper/Cupramine/other kill-all medication.
#2: Hyposalinity.
#3: Tank Transfer Method.
There are advantages and drawbacks to each of these three methods, depending on the kind of fish, your setup, and how much space you have. I used Copper and left my reef tank fallow for around 80 days, and it worked. Ich is gone.
If you can't take fish out, you can't defeat the Ich without wiping out your corals/inverts/and other biodiversity. Your best option if you are completely unable to QT is to get your babies as fat as you can, keep the stress as low as you can, and hope they pull through the 'bloom' of Ich. I don't suggest it and I couldn't bring myself to keep a tank that way, but there are many people on another forum that chimed in on Ich threads to give stories of successfully keeping fish in reefs for years that they 100% knew had Ich.
Hi Everyone,
I have a 220 gallon reef tank and fish with ick. I found this product below and it looks to be pretty decent, any thoughts on using this? Or if someone knows of another reef safe product out there that works on ick please let me know.
I cant take fish out or QT to treat at this point.
https://www.polyplab.com/products/medic
Thank you!
This link has it all 
