I'm the old days, when a cycle stalled, we added some macro algae to the aquarium. Snake oil? I don't know.
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I dont think its snake oil, it makes sense. Just like @Miami Reef is saying add something with other bacteria on it. Macro algae from another tank or the ocean or where ever will have other bacteria on it and it will also use ammonia, nitrite or nitrate. So it makes perfect sense.I'm the old days, when a cycle stalled, we added some macro algae to the aquarium. Snake oil? I don't know.