I had a 6" sugarfine DSB in a lighted gium with cheato and it caked solid in @ 6 months, so I removed it and did an 8" sugarfine remote DSB in an unlit bucket and it did not cake in 6 months so I'm thinking it is something to do with the light or the algae, however, I eventually decided that they weren't worth the trouble and weren't controlling my nitrates and removed it.
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Crap happens, that's why they sell toilet paper in 48 roll packs!
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