Subrosa - I have Leca from 5mm all the way up to 16mm, so I should be good.
Ray - I already set up trial reservoir heights with leftover cups I found in the pantry last night! I also have some covers I could put over them to form a ventilated mini greenhouse scenario if needed, but I have humidifiers in my grow space with an adjustable RH, currently set to 70%, room temp 70F. Decent, or should I adjust settings?