I ran an 8x8x4 block in my sump for about 2.5 months. No real changes to the tank as far as feeding,livestock or maintenance goes during that time. I had a very large spike in Nitrates. Started to dose the tank with NOPOX and just last week pulled the MarinePure block. Nitrates have started to drop finally. Could be the NOPOX making them drop....maybe it was the block generating NO3. I am not sure. I have read others that claim that the blocks can become nitrate factories if not put in a high flow area. Mine was in a low flow area of my sump.
Others love the block and swear by it.
Mine is out of the tank and now sits in a bucket awaiting its fate!
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125 gallon Oceanic mixed reef, Maxspect 150, MP 40QD x 2, EShopps 300R Refugium, Vertex 180i Skimmer, 2x Kessil AP700's, JBJ ATO with Advanced Acrylics ATO reservoir, Apex Next Gen with Neptune dosing pumps....and a bunch of other stuff including a lot of joy...and equal amounts of frustration!
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