Been using Red Sea Mg pro. My kit is about year old giving me a reading of almost 2000 with IO reef crystal. Went to a LFS who have a LaMotte water spin test unit ( the type that use the round disks). It gave me a reading of 1250, which made me feel a little better. Bought a new Red Sea kit, tested again and its still reading 1800. Are the Red Sea kits any good?
Thanks
Thanks