Yeah if all that's in your pond is a few goldfish you might want to supplement. I think I will have to supplement this year due to losing a few large koi last fall, I hope by using organic foliar feed I can avoid nitrite spikes in the pond. I always supplement iron in the aquaponics, I strongly recommend putting an old piece of iron somewhere in your tank to slowly rust and dissolve.
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A piece of iron in the water sounds like a good idea. I'll have to try that.