Yes, feed them the soaked food...keep the temp 80 or 82, and maintain a diet that fits the recommeded one for the animal(s).
Make sure your water quality remains in excellent order. You can remove and treat with copper if you prefer that method...but it sounds like you are not certain if they have ich...right?
If your fish are swimming as they have from day one things are probably okay. Watch for rubbing against surfaces. Still not a definite indicator as some fish do this. My Sohal does it all the time...for the past 5 plus years.
Also, I saw on another post where you just added another fish. This increases the possibillity of disease being intorduced and could increase stress on all the other fish in the system.
If you totally rearranged the rock when you introduced the new fish then all fish will feel some stress as thier comfort zone has been removed to some degree. I usually wait to see if one fish will pick on the new addition. If so I only move a rock or two near the favorite spot of the agressor. This usually works to some degree and has little if any disruption on the rest of the animals. Total rearranging along with a stranger in the tank can stress out the oldies for a brief period.
You do have a problem though if you decide to remove and treat...not sure how many fish you have but I know your QT tank is 10 gallons. hard to take ALL the fish out of a 55 and place them in a 10 gallon tank for 45 days...which is how long it will take for ich to die off in your display tank.... if it is present. You may try hyposalinty in the display tank and remove any inverts that can not live in the low salinity.
I would just monitor and relax. THink about how you wish to approach this as you have a few options should you see the disease. The fish may be fine. You will have ich from time to time...but if your fish have strong immune sytems there is no reason to panic.
Figure out which approach you want to take (other approaches besides my suggestions too) develop a plan...this way you know what to do should the time come.
Concentrate on prevention by maintainig water quality, a solid diet, vitamins with a little garlic, temp at 80-82 and low stress or no stress.