Hey Deja....do the plants like it? My biggest rez is 20 gal and has a stop valve at the bottom so you can let the water out and then I fill from the top. Do you have room for a third tub (same size or something.....) that you can put the plants on. I use an extra square tub that I keep around and lift the plants out of one and put them on the other while I work. You wouldln't have to leave this tub in the growroom....bring it in on res change day.