I don't like advising medications under your circumstances. However, if this were my tank, seriously--I would treat it with Aquari-Sol and carefully monitor things, being ready to do partial water changes daily.Well, the ich is getting worse I think... Should I treat them or just let it multiply? I'm not sure how you know when the cycle is complete, someone mentioned when the nitrites and ammonia are down for at least 5 days... I do not think the fish will wait that long
The reason I use Aquari-Sol is that in my experience it causes the least stress to the fish in the tank. I have never raised the temperature as they recommend, simply because the fish are already under stress and I have some fish that do not tolerate high temperatures that well and adding more stress doesn't make much sense. But if your fish can tolerate it, raising the temp is a way of speeding up the ich cycle.