Hi All, just joined and looking forward to some help setting up my new RO/DI set up. Use to keep and breed Discus so got most of the gear for water but need a bit of help in what order to place filter pods..... thread to come. I have 13 tanks in my cellar 5 x 30gal on a system, 5 x 50 gal external filters, 3 x 15 gal. Will be keeping and trying to breed fresh water fish but this is the place to get water quality right.