Carlo I believe the NP Pellets are the ones that are distributed in the Netherlands (they are Netherlands based, D. van Houten)
You tank is close to the same volume as mine. If my math is correct you tank is almost 53 US gallons. I usually don't like to compare grams to ml but in this case (hopefully I don't put my foot in my mouth) they are most likely equal

I don't remember packaging ever being sold in gram weight. That being said, using 75ml of pellets is a good starting point for that size aquarium. I would turn back the flow going into the reactor and have the pellets turn over slower. Nice, slow, tumble. When you noticed the bloom, how high were your nitrates initially? As the bloom has been clearing, what are your nitrates testing at now? Is there a difference since the initial setup? Each time you plan on increasing pellets, test your nitrates and phosphates. Also, try and not to do a water change prior to testing

You want to see how well the pellets are working by themselves before you continue to fine tune the setup.
Mike
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