The circumstances look dire. What are the tank parameters?
Liquid Test kit results asap.
Also asap do a number of pwc
, preferably with API Prime water.
Do you know when the last water change was done and how much?
There is a link for an article in my signature which tells of basic important information for fish keeping.
One large issue is the changing of filter pads for the filter of the fish tank. And understanding of the nitrification cycle.
I fear these fish have ammonia burns in addition to the Ich.
Water must be cleaned asap and the Prime has the capacity to assist in binding Ammonia, Nitrite and Nitrate.
Aeration at maximum amount, is critical when raising the temperature!
Freshwater Ich? Yuck! - Aquarium Advice