Hello beutho 🙂
I was just going online to put in a picture of precisely this method which you are mentioning, thats a funny coincidence. But so I will publish the photo to illustrate something along the lines of what you are suggesting.
I use this sometimes when I really dont want to disturb things – but I have no valve on it. Thats a good idea. The weighing down as well is a good idea..
Anyway, heres the photo … the hose could be shorter, but it doesnt really matter if it has to come down in a loop as long as the water container is above the tank.