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I have decided to change my substrate from gravel to fluval stratum plant substrate, I have already ordered it online but just now a came across a video and the guy reviewing the stratum says it contains ammonia! Help I have an completely cycled tank with fish and the last thing I want is an ammonia strike! Does fluval stratum really contain ammonia? And if so is there a way to get rid of the ammonia before putting it in the tank?