Water Chemistry Query

[Chaloupa]

Just tested some water for a friend.......this is how it breaks down;

All tests done with Elos kits

Mg 2000 ???
Alk 6
CA 500+ ???
SG 1.026
Nitrate 1 on the Elos chart
pH about 8.02-8.05

Anyone make sense of these kind of readings. He says that he adds NO additives.....and now his corals don't seem to be thriving (namely a long tentacle plate which we all know isn't uncommon)