I put them in a cobalt canister filter and almost immediately speeded up the cycle process in the new aquarium. I have black fluorite sand in a planted tank in Arizona causing a dust storm that typically lasted 3 days after being kicked up. No matter how much I do now, the water won't be cloudy for more than 3 hours. I think filter placement will make a difference as mine is in this order: sponge, 3 to 5 layers of 50 micron, biomedium, ceramic rings and glass beads and then finally charcoal. That's the most successful for me, my water stays crystal clear, the current hasn't suffered much.
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