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thats a new one?? never heard of light being an issue

As you can see my other thread with my diy k1. At that time, out of curiosity, i made 3 small k1 bottles and ran them in different conditions. The one on my 2ft fry tank with no light, only room light, and weekly 50% WC took ages to get cycled, couldnt remember how long. While the bottle in highlight planted tank with co2 and dry ferts get cycled quickly in a wk, even with nice green algae.

The huge one on africans tank with low light took 3-4 weeks with dark brown algae.

Btw, cycled not only mean it is easy to turn with air, but also can be measured nitrate level.

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