Listen, I don't know what's in your aquarium water and how it can benefit your plants. Also keep in mind that there might be chemicals that may harm your plant... The PH is definetly too high for a MJ plant. I read that the plants like a soil anywhere from 5.5-6.5PH, and adding this very alcaline water could very well change the ph of the soil, for the worse.

I would personally recommend regular filtered water... It's not worth taking the risk with aquarium water, imo.

Cheers

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