[danny zubot]

I think shrooms shouldn't really be used as an example in this case. They are very close if not in the same family as anemones which can contribute greatly to the bio load of a tank. I agree that most other corals don't contribute very much, in comparison to fish and crustaceans anyway. I think the trick (though I still haven't mastered it) to preventing algae blooms is to not make sudden changing in the tank that will overwhelm the delicate process of nutrient export. Adding too much to quickly and the nitrifying and denitrifying bacteria can't keep up resulting in NH4 spikes and blooms.