its costing me however much it costs to run maxijet 1200. I'm just running a zeovit reactor with 1 liter of zeolith rock. Im also dosing a mixture of vodka and vinegar to feed the bacteria in the reactor. I haven't really dosed bacteria in a while. I need to get on that. I like it, if anything i think it helps feed the corals because i get a good feeding response when i shake the rock.