Hey guys. Sorry it's taken so long for me to write back. Thanks for your replys. Littlesilvermax: I think you're right. I tested the main tank water about a half hour after adding the water change water. I was in a bit of a hurry to do the water change too so I only waited about an hour for the Mg to dissolve in the new water and then about three hours for the salt to dissolve so that probably didn't help. The corals are all looking fine. I'm starting to wonder if the dying tips were a result of too much ozone. I discontinued the use of ozone and I haven't noticed any more tissue loss.
Steve: I don't dose Mg regularily but I did add it a little bit at a time with my top off water for the first few weeks to get up past the 1300 mark. Now I should be able to maintain it with water changes plus Mg.
I tested the water change water after the salt dissolved before adding the Mg and it tested at 1180. I use Kent salt. Sometimes you never know how accurate you're being with those test kits though. Some of the salifert test kits ask you to add a scoop of whatever powder you're using but some specify to use a level scoop and some don't specify at all. I've just been using a level scoop on all of them and hoping that's what they want. Everything still looks good though so I don't think I have anything to worry about at this point.
Littlesilvermax: You mentioned in your vendor posts that you use Randy's recipe. Before I added Mg to the water change water I looked at this chemistry calculator to see what it recommends dosing:
http://jdieck1.home.comcast.net/chemcalc.html
I referenced the Mag Flake recipe and Randy's recipe to see what it recommended. They were both quite far apart but the Randy's recipe was pretty high. Do you use his recipe exactly or a variation of it?
Thanks again for all your help guys.