I found what I'm using, it's fauna Marin mag chloride.

I just tested again and alk is still 6, mag 1350.

I must not have mixed the alk right. Will test it.

Thanks for the offer warriorcookie.

Here's another dumb question, and maybe it will make sense after doser is set up, but why the check valves?

The check valves stop the solution from flowing backwards out of the tube. When this happens, the doser turns on for the set time, but has to pull the fluid up the tube again before it starts coming out the end. This means it wont dispense the correct amount of fluid, or none at all. Usually you only need them for some of the cheap 3 roller pump heads. The better 4 roller heads generally dont have that issue.

Have your Alk numbers been fluctuating like that alot? The loss of corals might be more from fluctuating alk rather than low alk.

Ah, that makes sense on the valves.

Fluctuating alk has only been since I started dosing otherwise it's always been at 6, the coral loss has been on going for a while, however the frog has been dieing over the last few days and is worse on a daily basis.

I've moved my frogspawn over to my other tank. I read through my journal over the last year and the parameters in the 55 have been the same since I set it up. The frog is deteriorating daily, unfortunately we are going away for the weekend and there's nothing I can do over the next few days. My daughter deals with the tank while we are away and she doesn't have enough experience to do more than adding water to the top off. if I was around I'd find someone who could take it for me right away until I can get things stable. I'm so sad about this, crazy eh...a coral making me sad.....

I got my doser set up last week before we went away but didn't have time to get the check valves or test before we left. I tested today, alk at 6, mag at 1150.

I mixed the alk at 1/4 cup to 20 cups or water and this was fine when manually dosing. for alk I was dosing 2cups to raise 2'points, mag was 1 cup to raise 100.

Ive got the doser set to pump 1 cup of each throughout the day. I had the mag and alk at 1350 and 8 before running the doser but my settings are not right. I'm grabbing the check valves tomorrow.

Do I increase the dosing until its where it needs to be or do I add more mag and alk to the ro water?

personally, I would up the amount the pump is dosing..... the more dilute, the solution is, the less effect its gonna have if something malfunctions.....

Finally have decent results. Mag up to 1450, ca at 460, alk still at 6, so I've adjusted the doser to pump more alk, dropped the mag slightly and added check valves. I did a water change yesterday (40 gls) and will do another one early next week with the new salt. Will continue to test daily until things are stable.

My frog has been moved to another reefers tank as it continued to recede, hopefully he can help bring it back.

I want to rescape the tank but wonder if I should leave it alone for a while?