Well Leah wate till yu get ride of the 25g and add that rock. LOL I wouldlie to be able to help more only if you were in the same town. You are so easy go and a very nice person, any way you have to also come up with that sump plan. Then egtthat up and running you willnot go back, it dose take some of the work out of it all like topping off the tank. you get an ATO for that and a bucket that fits in the cabinet that is also anouthe reason why I think a 40g sump would be good size that leaves you will room for other stuff. I have a JBJ ATO witha onamental water feature pump pluged into it.

Bill