a little extra humidity won't hurt right after watering. Just as long as exhaust and intake are good, your plants will get the fresh air they need. Watching your watering and nute schedule is important! That is what I see cause 90% of indoor problems, especially over fert.... its a lot easier to get away with outdoors... underfert is easy to fix. something that I have actually been playing around with in theory is a revolving soil setup, where the soil is being revolved, old out, new in, every like 3 or 4 days, at the same time as watering... not the entire pot, just like 2-4 inches coming out and going back in. old from the bottom, new in on top, being watered in. Kind of like a hydro with soil I guess...