GHE Flora series - forgot to mix between bottles

they say that I have to mix after each bottle I put in (grow, bloom, micro). So I forgot to mix between and only mixed afterwards! is that alright?

As long as you dumped your nutrients into your full reservoir and didn't mix them directly together without water, you're good to go. It's best to put in Flora Micro first, mix, then add the others (mixing in between). According to GH, you just don't want to mix them together full strength because it can cause nutrient lockout.