Welcome to Fish Lore

I'm sorry your fish aren't feeling well. Are you sure it's ich?
Just a small correction, Ich is a parasite, not bacteria. You'll also want to increase aeration to make up for less oxygen in the warmer water.
Otherwise, good advice IF you're dealing with ich.
Can you post a pic? I wonder if it could be somthig else if they're missing scales.
Also, it would help if we knew the readings for
ammonia,
nitrite and
nitrate?
Any other tank mates? if so, what kind and how many?