Nutritious substrate for under gravel filter?

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It would have been better if I had posted in the proper thread. ;) OT, I watch AquaGreen scaping content and was amazed that they build substrate with additives mixed in. Are you doing something like that with your gravel filter?
 
It would have been better if I had posted in the proper thread. ;) OT, I watch AquaGreen scaping content and was amazed that they build substrate with additives mixed in. Are you doing something like that with your gravel filter?
Maybe might want to switch the filter. Thanks for recommending that channel
 

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