I've changed from a bare bottom tank to a ~3.5" sand bed. I currently have just an empty tank w/sand, SW, sump has only water running through it. (eg removed skimmer, and carbon reactor) Yep, I've got the heaters operational. To give you some background info, I've relocated the LR, fish, and coral (eg mix of LPS, softies, and 2 SPS's) to a 40g breeder tank as a temporary home. I utilize (2) Kessil 150 pendant LED light fixtures. I've got some tuffs of GHA growing on my LR. I've tried everything: w/c's, ozone, GFO, bio pellets, etc. Now, I'm willing to make one last investment on clearing the GHA. I feed approx (1) cube 3x per week, and 3 pinches per day. Sorry for the long & lengthy rant. I just want to get this tank running correctly, hopefully without the skimmer. I'm okay with running a carbon reactor. Will an L2 suffice?