I'm going to be adding an RO unit into my fishroom as I am adding more south american and Asian fish to try and keep and breed. What brand do the Pros use in their fishrooms and consider the best quality? Best deal? How many stage? How many gallons per day? I used to have an under sink 4 stage but at 4 gallons a day was too small. I'll be setting this up myself very soon and can't really decide on what exactly to purchase as their are tons to choose from. Looking for quality at an affordable price. Suggestions?