I use to run a bunch of reactors, but keeping it more simple nowadays. Reactor for the pellets, but running GFO in first bubble trap, and carbon in the last one before return pump. Using the traps for these, allows lots of flow through the material, and from what I read you don't need to reactor them.
I change out GFO monthly, carbon mid and end of month.
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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