Sulphur Exposed Plants

Hey guy first time grow here was going well, with 2 plants 400 watt hydro setup. I had to fume agate my tent with sulphur and had moved my plants into my cupboard but the tent wasn't sealed properly and my plants have been affected HEAVILY by this. The info i am looking for is, What would be the best plan of action to give the plants the best fighting chance?? So far I have made sure they have plenty of water

Many Thanks in Advance
 
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