what do ya think of this. i am tired of tanking 5 gal buckets and mixing water on the floor in front of my tank...i have to take out 5 gal at a time...and add 5 back twice for a 10% water change once a week...so i think i am going to make a rolling shelf with two 20gal tanks on it..so i can keep it put away and roll it out when its time to use..the night before ill fill the top tank, and mix the salt......has anyone done this...if so what do ya think???....if i do 20 gal at a time can i do my water change every two weeks????....thz...rich