I use GFO and carbon in mesh bags in my sump. I have a TLF reactor wth biopellets. I did have cheato, but when I started using the biopellets and GFO it stopped growing. It never really died, just turned dark green..so maybe it was on its way to dying. Either way, I have taken the cheat out. I have an in sump skimmer (not sure of name/model).
Slicer Jay said I should dump the pellets and go back to cheato, but I am thinking the GFO was causing the issue to my cheato. It was growing like wild before....
I used all of the above as I brought in some GHA on a coral and small pockets started popping up here and there, but never really got bad (I became quite adapt with tweezers....call me edward tweezerhand). Well, I added some emerald crabs several weeks ago and I am now GHA-free for several weeks. Not sure if it was them or the culmination of all of the above.
I change about 20% of my water every two weeks. I have a RIO with two DI'sf for my water. Not sure what salt I use....I think Ocean something or the other...
I do not use any chemicals.
And if you don't know already, I have no SPS, well one Jason gave me at our meeting... so our needs may be different depending on what you have in your tank????
Shorter answer: Yes - GFO, Carbon, Pellet, skimmer No - chemicals and heavy water changes