- Alk: I've tried Salifert (good) and Red Sea (IMO, just as good and easier to test)
- Ca: API (don't laugh) and Red Sea (consistent, but wish it wasn't a 3-reagent test)
- Mg: Red Sea (consistent, but I hate this one the most with it's first of 3 reagents taking so long to add)
-PO4: Hanna (hated it, I just roll dice now), Martini MI-412 on the way
- NO3: Red Sea (kind of pointless given its range), Elos (accurate, but a bit diffcult to read on the color strip at ULNS levels)
- K: Salifert (rapid color change on titration makes easy to read, but cleanup is a pain)