I ran my 200 gal tank with fish and corals sucessfully for 3 years. Corals & fish were both thriving. Simple filtration, sump with drip plate going through very dense stoney material, Accu C skimmer, and Aqua 57w UV.
Saturday I decided to add about 150# of sand. I used a dry marine sand, my rock was plenty cultured so my thoughts were it would seed the sand and things could only improve on the nitrate side. I also changed 25% water with a new salt. I had been using Reef Crystals, but found a great source for another brand from Marine enterprises that supposedly was the best salt you could buy. It boasts that it does not contain any EDTA. It also says when transitioning from another salt to only do 5% changes for a while. The lack of EDTA changes the chemisty of the water dramaticlly. I did not read this until after the water change....
About 2 hours after the sand and water change, I started to get that wonderfull pile of Zenia smell. And all the corals and other inverts basically turned inside out. I have removed what I can, but left some corals to use as monitors to imporvments. As of now my test corals have continued to deteriorate, and the smell persists throughout the house.
I spoke with the manufacturer of the salt, and they said everthing should straigten out in a few weeks, I just stressed out the corals. They are beyond stressed, and I belive the sand has something to do with this also. I added and ORP meter tonight, preliminary readings are around 155, very low.
All other tests are fine, ammonia, nitrite, nitrate, PH, KH, phosphate...
Anyone have any ideasn what the H-E-double hocky sticks happened?? What can I do to bring the ORP readings up?