Many people use MB7 with biopellets so that the right bacteria gets the carbon source instead of the wrong ones. Biodigest is also the right bacteria (similar to MB7) so I guess it shouldn't be of any problem but possibly only better for the system. 400ml for 250g seems a lot less than what my math would suggest. I guess you are through the slow starting phase so maybe you might want to add a little bit more to the reactor?
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You wouldn't want to see my tank. I don't use fancy equipment and I am a noob 
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