I believe shrimpnmoss did that....I think that's the guy......I think the buffering capacity was lost too quickly just too much flow through and wore the buffering capacity down. He used a inline prefilter canister.Has anyone tried putting ada substrate into their canister filter? This way you'll waste less substrate & have the same good buffering, breeding & survival rate effect!? Does anyone one know if shrimps (like CRS) eat off the soil? we can help a lot of hobbyist if someone wants to try this experiment out.