can you post a fts of your tank in its current state?

Agree 100%. Dying animals will do nothing good for a struggling tank.

Here's my before FTS and after and some closer pics. U can see all the dead sps in there

http://i1292.photobucket.com/albums/...ps49kdb2gp.jpg

http://i1292.photobucket.com/albums/...ps6tygd10f.jpg

http://i1292.photobucket.com/albums/...pskjxs52mi.jpg

http://i1292.photobucket.com/albums/...psunazdtt7.jpg

http://i1292.photobucket.com/albums/...psw3fpezet.jpg

id try removing the sandbed or most of it for starters

Probably not a bad idea. You also don't have the load or growth right now to worry about dosing, I'd turn it off and rely on good water changes every week to get nutrients down and maintain levels. Manually remove what you can for algae and blow off the cyano growing on the corals.

What's wrong with sandbed? Are those corals 100% dead already?

Sand is probably holding a lot of nutrients. And ya, I'd say most of those SPS are beyond recovery, unless you got them in a perfect system right now. Anything that has algae growing on it is gone, get rid of it. Anything dying is adding to the nutrient load. Again, get it out.

I always vacuum almost all my sand every single water change if that helps. Water from it is normally pretty murky. But I'm sure that's normal. My tank going to look so empty if I take out all my dead sps =(

Is vacuuming sand bed a good thing? I have never stirred up or vacuumed My 120 gallons sand bed I thought it just stirred up nutrients. I thruthfully don't know if it's good or bad.

I think you have to do what I did when I didn't know what was happening to my tank - stop absolutely everything that you're doing/dosing, and start a campaign of massive daily water changes. Change that water as fast as you can make it, up to and including at least 1 100% water change. Do this with a better salt than IO, something that mixes up with alkalinity closer to NSW levels.

Something is wrong in your tank, and by extension your water. You can bang your head against the wall trying to figure out what, but sometimes a 100% reset of the medium your corals are immersed in is the only way to completely eliminate all the unknowns.

I'd continue doing 20-40% daily water changes until the surviving corals stopped declining and started to improve, then I'd switch to once a week water changes, but bring the doser back online and adjust it every day as needed after testing alk, calcium and magnesium. I'd only switch to once a week testing after things definitively stabilized.

This saved my tank when I couldn't figure out what was killing my corals, and it saved it again after my tank nearly died during a renovation.

Came home n found my coral banded shrimp dead!!! Man this is so whack. I'll try to do a lot of water changes

Maybe try testing you water with a buddies set of test kits, or take a few cups to a LFS. Make sure they are getting the same results.

Finally seeing some long hair algae die n peel off my rocks. Also manually pulled out a ton during yesterday's WC. Hopefully my tank an bounce back. Going to do another WC tmr

How long should I leave my doser off for? I'm leaving to vacation in a few days for a week so dunno if I should leave it off till I come back. Going jamaica. Hope to see amazing coral reefs there to take my mind off my ****ty tank.

Leave it off until you fix the tank and have things growing again.

Just got back from my short vacation and my tank doesn't look like it has anymore deaths. Some zoas are starting to open up a bit but not all the way. Doser been off for a week and a half nd my kh and ca still stable but mag is kinda low at 1250. Did a water change changed out my carbon but left my rowaphos alone. Should I turn my dower back on yet or wait?