ok, your question confused me a little. u said u started cycling jan. 11th and have had no ammonia and nitrite. It's jan 26, today and you said "is it possible it cycled overnight?" Overnight? It's been cycling for 15 days. If it doesn't have ammonia or nitrite by now than it's cycled. The only way u are going to lower nitrate is if you perform partial water changes or get an ass of plants, denitrator, or somehow figure out how to cultivate and keep alive anaerobic bacteria in your tank.
Posts by CHUD
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Look, the man used established media. That's the point of using established media. So you don't have to wait a few weeks to get the tank cycled. The whole point of cycling tanks is to establish beneficial bacteria and you already have enough from your previous filter media
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