Rather than ADFs, BettaMiah, shouldn't you spend the money on some more cories to boost the school? They are social fish. :) Social fish in groups = less stress = less chance of getting ill, and cories are pretty susceptible to stress.
Not meaning to be rude, just offering some constructive criticism. :)
I have 3 panda cories (I would have four, but every time I have had four I've lost one, so I think the Fates are trying to send me a message), 10 gorgeous ember tetras and my RCS. I love to watch them trundling around, landing on my other fish then jumping off in fright, crawling over my hand during water changes, walking upside down on the surface to eat floating food...I love my shrimps. And their 6 million offspring.
I don't love my snails and I want them to go away.