I have a 125g that has south American cichlids and I'm kinda tired of the fresh water side of it so thinking of selling off the big guys to friends and setting up a 125 fowlr. Now my question is can I run it off of the fx6 I currently have and simply change out the media and sponges. I mainly want a porcupine puffer but it's just an idea

with HOB skimmers from time to time, but it's fairly easy to use rock or other decor to hide most necessary equipment inside the tank. I run a 29 gal with a HOB skimmer, a tiny pellet reactor to help keep nitrates in check, and a double bio wheel HOB filter for added surface oxygenation. I have chunk cut from a block of Marine Pure and some Marine Pure balls as support for the lack of live rock. The HOB filer usually houses just filter floss to catch large particle waste, but I can add charcoal for water clarity or other media as desired. Since it's a FOWLR, you don't need expensive lights. What you use for the freshwater fish is probably fine.The aforementioned 29 gallon tank has been up and running about 10 years. It's never crashed.

