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Reducing the phosphate level can help prevent the growth of all slimes and algae, but certain places are just more prone to it. If you are getting a lot of growth on the skimmer output, check to make sure you aren't getting skimmate coated microbubbles in the tank.
also, mixing carbon and GFO in one reactor will waste money, not save it. The carbon will need to be changed more often so if you mix them, each time you do replace the carbon you'll probably have dump out the GFO, which is more expensive and has a longer lifespan.
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