I want to set up an old 55 gallon tank that measures 48 X 21 X 13. I saw a paludarium in a pet store many years ago and fell in love with it. It had a soft cascading water fall with teeny tiny fish in not much water in the bottom. The plants were absolutely beautiful. I don't know if the light and filter requirements would be the same for an aquarium versus a paludarium. I just don't know what lighting and external filtration system to use so I will take your expert advice. I have reviewed the HQI systems and Eheim filters but is that overkill? I would really like to learn from your mistakes---if you don't mind.