Quarter pound Lemon skunk

Ran into an issue with calmag and or fungus gnats. The plant is showing major leaf damage and yellow dots on the leaves. This started with lower leaves but is now on newer growth as well. Mostly the quarter pounder but the lemon skunk is showing the same signs but to less degree. Added a feed of magnifical to help the calmag issuse. Added a dehumidifier to bring the RH down and letting the soil dry out before feeding again. Also going to dilute some 4% peroxide with water to kill any gnats or larva in the souls as well.