I have 3 tubs in a rack now and i been having trouble with my humidity being really high. The first tub is 67% and the second is 67% and the third one keeps going up to 80%. I believe my room is at like 50% humidity too so i guess thats why the tubs go so high. Does anyone know a way that i could drop the humidity in the tubs? and do you think i should add more ventilation holes to see if it drops the humidity any?