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I'd be leary of adding enough nutrients with fish waste alone, Excel or CO2.
If you can raise the light up some, that will help.
You can do it with Excel, It'll do better with less light though given your goals(no ferts)............
Regards,
Tom Barr
If you can raise the light up some, that will help.
You can do it with Excel, It'll do better with less light though given your goals(no ferts)............
Regards,
Tom Barr