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If reeferfoxx said prorocentrum, I would go with it. You could certainly have many types, but nutrients will help with all of them and UV will help with most of them.
Oh am I misremembering which kind I had?
I added a 36W jebao UV a month or so ago. Reasonable flowrate more inline with trusted industry brands recommendations.
I use salifert for nitrate and the ULR checker for phosphorus. I usually clock in around 0-3ppb, which is within test error of 0. Nitrate is never any perceivable color change unless I've recently dosed.If you have good test kits and are reading zero, you have too little nutrients. I would have a Hanna ULR phosphate kit for sure.