A while back I posted about my DT having very low potassium levels and after much research I am thinking it is part of the reason my coral colors are not where they should be. So I've done many large water changes and still 330 ppm potassium. I started testing fresh salt batches of reef Crystal's and I'm getting results of about 340 ppm which is still low. Anyone else use reef Crystal's and tested for potassium? I'm curious If I somehow got a bad batch or something. My new routine is to add potassium to water changes water to bring it up to 430ppm