take this

by chris
(madera)

I just changed the water in a waterfall i made using your method. it was the same method with a diffrent pump. it took me an hour to drain and refill the water. Right after i got done my two iggies mary jane and raven (male) got off their branches and both pooped in it. I practicaly cried because it was real watery and infected the water and made it cloudy.