If you want to eliminate that it's EI dosing just use some K and micros for the next few months and see what happens. Every tank I started with aquasoil that's all I did for the 1st 6 months and everything started up clean. Granted all tanks are different but the AS is so loaded that you don't really need much else in the beginning.
If your getting BBA that quickly to me that's an organic / light / co2 imbalance.
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