I had my suspicions as well, as I said in the equipment thread I didn't even think I would bother to begin with. I could never read nitrates and phosphates on any test kit, but there had to be some as I was battling cyano for the longest time. The scrubber definitely seems to be the turning point for me though, if you think about it logically, the algae has to grow on something, and when you're regularly removing it from the scrubber you are physically removing large chunks of nastiness from your water. I would definitely recommend a scrubber, whether it be the one I have, a diy version, or even just a lamp and screen set up in the corner of a sump, growing the algae definitely seems to remove a lot of rubbish from the water
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