As far as the 'substrate being depleted', and 'fertilizing the water column causes algae', well I thoroughly disagree with the latter, and don't worry about the former. I've been fertilizing water column for a while with no algae blooms, as have countless others around here. Do a search for some of Tom Barr's posts on his 'Estimative Index', and about fertilization. It's a lot cheaper, and it works.
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