How long ago were you making these changes to the substrate?
Iím not an expert in plants, but just when it comes to a closed eco system, that substrate is crucial to have the right bacteria to balance the chemistry.
This isnít going to be a problem that will fix itself overnight. Just keep things steady, and monitor the changes. If it blooms and gets way worse, then you might have to scramble, but in my experience, just try to keep things steady for a couple of weeks, and the system will likely recover.