zeo spur can kill your corals if overdosed.

yes i realize the water isant perfect. I am running the Ca reactor for longer times now it is running both Ca and MG pellets so this should help that. I am a member on the Zeo site and they were very help full in getting started with the zeo system. I havent heard of any problems with H20cean salt and zeo I was told it is a good altenative to reefer best. The system has been running in this form since May it was upgraded from a 265 too a 300 all the same rock plus a few new rocks and a new sand bed. I dont know what has brought my Alk down.

I am using zeo spur2 dosing once a week

Who long it takes the corals to perish?

Do you feed them regularly?

What kind of coral are some doing better than others?

I agree with Coral master.

as well, how much spur2 are you using ?

What are your daily temp ranges?

Temps are fine it runs a high of 82 with all the lights on and down to 78-79 at night.
I am dosing 15 ml of spur2 once per week it is a 400 gallon system.
all mushrooms are doing fantastic ric's are doing well getting good coraline growth my pink tip eligance is as big as ever some of my sps are not doing too bad and others are still alive but going brown the ones that die seam to be going through a slow painful death it takes about a week or two.the corals get feed with zeo coral vitalizer every night.

What tip of light are you using? How old are the bulbs? Maybe the bulbs shifted spectrum? Just a thought.

I dose 2ml of spur2 every week or two, too much can take away all their zooxan alage. maybe try cutting back on this, as well, if you wanted to try just dosing the basic four, start, food, bak and CV. until everything comes back on track. its just a suggustion.
also when i started the zeo, i found that all my coralline died, as the zeo was taking all that extra stuff out of the water.