I guess shrimp soil usually don't release as much ammonia (unlike ADA aqua soil), so ammonia in an empty tank such as yours shouldn't climb too high at start up.
How about nitrite and nitrate levels?
If BN7 is a bacteria-in-a-bottle type solution, then it should help the cycle by establishing some good bacteria in advance to break down ammonia to nitrite, then to nitrate. So observing how fast the conversion/cycling process works will test the actual effectiveness of BN7.
Nitrates still have to be removed by either plants or water changes though.









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Do not, I repeat. DO NOT, use duck weed. It is called a weed for good reasons.





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