this would be hard as you cant heat up the tank fish fish inside as the ich will just reproduce faster... but you have sensitive fish and shrimps which means you cant heat the tank or they die.... what i would do is take the shrimps out as they cant get ich put them in a spear tank, then with the tank that is infected, i would dose come medications in small amounts about half of what the bottle says and see how your fish reacts to it... if their ok for the next few days then add just a pinch more ever few days till u reach max dosage on the bottle or when your fish reacts bad to the meds...
if the fish reacts bad to it then do a 25% water change and you should then know how much your fish can handle... then treat the tank every time you do a water change... till all the ich is gone off the fish then continue treatment with meds for the next 2 weeks just to be sure all the ich are dead...
if the fish reacts bad to it then do a 25% water change and you should then know how much your fish can handle... then treat the tank every time you do a water change... till all the ich is gone off the fish then continue treatment with meds for the next 2 weeks just to be sure all the ich are dead...