Hi is it possible to use fish poop from the other tank I'm running to cycle the new tank?
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Why not use media from an established filter
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Most of the ammonia released by fish is from the gills, and very little from defecation. If I understand the biology, animals in water typically don't need to expel excess nitrogen in the forms used by animals outside of the water, so the waste is really mostly waste---probably ash, bone, shell or other indigestible materials. It contains very little ammonia, unlike urine for example.
Seems like you'd need an excessive amount and would have little accuracy. I'd choose pure ammonia or if not that, simply dose the tank with fish food. I've used both methods with 100% success. Ideally, a mature seeded filter medium would be great and there are commercial products that can help as well.

I would try testra safestart I cycled a yank im less than a week with it