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I used to use a bit of rainwater to cut my fairly hard tapwater to soften it a bit for Apistogramma species.
I filtered it through carbon, and paint gun paper filter before using it.
Agree with above,there should not be any more nitrogen in rainwater than tapwater unless the water is picking up dead insect's,bird crap,or other organic's from guttering or tub where rainwater is stored.
I once left the lid off the tub that caught the rainwater from my guttering and found a dead squirrel in the tub.
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