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Mix my own. I have tried io, reef crystals and salinity. Probably going back to IO since its cheaper and dont need the extra cal or alk since my reactor does that part
Pellets will raise po4 a bit, but I don't think it will keep them that high. Do you rinse your frozen before dumping it in? Depending on your fish, it may just be better to float nori or romaine and just feed frozen.
That could be the source, if you soak it in anything I would try not to rinse all of that off, but don't dump all the "stuff" in the cup with the frozen. I rinse then soak in zoe, then dump that into a net over my skimmer bucket, then feed.