This condition most often is seen in a newly started aquarium, but can also occur in a tank in which there is has been an increase in the nutrients in the water, particularly nitrates and phosphates.
In new tanks, the bloom will dissipate as the nitrogen cycle becomes established and stabilizes. Maybe the act of replacing the clogged polyfill which contained your beneficial bactiera caused the outbreak.
Regular partial water changes and good tank maintenance will usually prevent severe bacterial blooms.
Still the cause of a bacteiral bloom was not the polyfill, I'm not going to argue about but there are certain facts when it comes to these conditions and inadament objects are not included in their causes.
So please don't bash a company on a public website claiming their product caused your issues, especially a product not designed to be used in aquariums initially. Plus this is against the forums rules,
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