Pumps and 'tumble'
I also bought the U15 and an MJ1200 and found that with 500ml of pellets there wasn't enough flow to keep them tumbling, so I put an AC 802 (with about 30% higher flow) on. I have also added another 500ml for a total of 1000ml. I now have a very nice slow tumble througout the reactor.
My pellets have been running for almost a month now, and I saw a bit of cloudiness during the second week. I have also seen some cyano, but nothing major.
My tank had excessively high nitrates, and between that, some agressive water changes, and really good skimming my nitrates have come down from 'utterly blinding' to merely 'horific'
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