I was reading on this Riparium type of aqua scape, and I'm a fan. I love fish and I love plants. I know some fish can live in very acidic water such as cardinals, Discus, etc. if using RO water on a system like this. would one be able to add Sundews? Pings? any other bog type CP's to this? just as an additional to marginal plants. I figure if the bio-load is light by only keeping a few cardinals would the water be ok?