If was big enough, it might leech Fe+ into the tank, perhpas fueling algae, or at least acting as a catalyst if you've got enough other nutrients. However, in as much volume as you have, I wouldn't give it much concern. As I mentioned when you were over, the small infrequent water changes are probably worse than a bolt. Now that you are doing bigger changes more often, that is probably contributing the better health you're seeing.
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Brad
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