When you change salts your not just changing a few levels. In some cases you may be drastically changing a mass array of elemental levels. This can shift not only the biology within the system but also the chemical reactions and stability that go on in the background. When you use a certain brand of salt for a period of time you create a local environment of specific parameters, when you switch salts you subject your entire system to drastic changes in the environment they have adapted to. Any shift, instability or imbalance can be a trigger for a bloom. Go slow. Don't compound the issue with more and more water changes right now. Give the system time to adapt to the new environment your subjecting them to.
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