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The problem with citrus indoors is spider mites. I spray them with neem oil solution or haul them outside once a week if not freezing and blast the underside of leaves with hose. I have also put them in the shower to let it rain on them. Mites don’t like water or humidity. After using miticides with inconsistent success in the past within a cold frame environment, I eventually went to mist lines just below the poly covering. Although there's an occasional mite seen, there's no discernable damage. The mist lines also serve as Summer cooling equipment.
The problem with citrus indoors is spider mites. I spray them with neem oil solution or haul them outside once a week if not freezing and blast the underside of leaves with hose.