Give the 2 hrs on 2 off anouther day or 3 the fish will get use to it I have done this before to control agea bloom that happened when a timmer went bad so now all my timers are mechanical not digital.

Hang in there it will turn around. one thing for sure you probable don't have parisites right now. If you have a UV serilzer I would make sure it is going in the sump it will help combat Ick if it rears it bad head. Also it will kill any bad parisites that are in there so it dose not get to your fish. there ammune system will be down right now fighting the burn. Feed with extra garlic in all meals, this will also help in the recovery.

Bill