NH4 and Ammonia can cause algae blooms, as would phosphates and nitrates. Ammonia, phosphates, nitrates, etc. can all be used by algae as a food source. Give a plant tank a small ammonia spike, sit back and watch your tank turn green with algae within a couple of days. Though it is a freshwater system, I'd suspect that the principle is simliar in SW systems.
-Rich
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