Ok so I bought a use sump tank but I am kinda worried cuz the guy had a real bad algea problem an I don't want to get it. So last night I filled it up with fresh water and put a pump in it to circulate the water. Today when I got home I drained out the water and dried the tank inside and out. Now I am going to let the tank dry over night. Is this ok or is there a better way to clean it?