so i took a new pic of my roots,theres been a lot of new growth and i think they look good
A good idea might be to purchase a hand pump, and manually drain out the water by just opening the lid enuff to get the thing down there, or cut a hole and cover it for when its not in use. The only problem is cleaning would be difficult, best wishes.
http://www.idm.gov.vn/Nguon_luc/Xuat_ban/2005/B25/b63_files/image001.jpg
just an idea !