Or run Zeovit the rock in my current tank is 14+ years in tanks so imagine in the early days the tech we were using my tank now has a very low PO4 reading (Hanna) I know I know my tanks about to crash :-?
Have a friend who keeps Discus and isnt having any luck growing plants, He has T5 lighting and wants to run CO2, What does he need ?? I can only advise him on marines! Thanks in advance Steve