I need at least one more block of algae for my system to process nitrates. I currently have two ideas, and am wondering if people have experience or opinions or whatever as to which to do here: Option 1: A big 25 gallon fuge. Idea is simple. A 25 gallon tall AGA tank with a massive overhead growlight LED (probably a chinese blackbox "300 Watt" (115 actual watts) light) Area dedicated to growth would be pretty much 20G of actual space once I add a baffle or whatever to stop the chaeto from spilling into the main aquarium. Option 2: 2-3 Chaeto reactors. Idea would be to get a few big media reactors (probably in the 30" range, so about 2.5L each), wrap them in LEDs, and feed water through them. Easy enough, right? So my question being, which would provide more nitrate reduction? I feel like the 25G sump would have more space overall for growth, but with top-down lighting, not sure how much the lower algae will really grow. I would also probably get less water movement through the sump than the reactors, because I could hard plumb the reactors into the aquarium easier and just blast them with movement. I'm kinda 50/50 on this.. so any comments or thoughts appreciated, especially from those that have done either of these solutions. Thanks!