i would venture to say its amquel that is causing the issue. Even if you do have ammonia, it is binding it in a form that is more difficult for your bacteria to convert to nitrite, then nitrate... so stop using it, keep up with waterchanges, and dont use any algaecides of any kind. keep testing your water, feed less. as things settle down your algae (brown is probably diatoms) will calm down as well. dont stress
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