in my 50g I have a return pump =350gph, 2 6055 nano's and a MJ1200 total of 3515gph or 70X turn over

SPS dont need a reason to not make it, just being sps is a reason. :lol:

Ok, I agree pics would help, esp. giving the acro experts here a look see. I dont agree salinity is a problem, although I would never keep my sps reef at anything under 1.024 -1.025

Magnesium is important with those corals. And its relationship to calcium. If your depending on water changes with IO to keep it up, and unless something has changed, it has low magnesium. I always use IO, but add calcium and magnesium, following Ben,s {chemmaster} formula. Mag. always stays at around 1350 this way.

I would also run a lot more current in an sps based aquarium of that size. My 90 is just softies now and I still run two large Hydors, {1200gph}, two large powerfilters and a Tunze 6080, rated @ 2200gph.

Ok my mistake i run koralia 4's at 1200gph each and my return pump is a 1200gph magdrive combined with my nano im making around 3800gph this isnt enough? my nano is directlly infront of my last acro colony. I talked to the place where I last got my corals their salinity is 1.024 where mine was 1.023 so I doubt thats the issue. The bulbs in my system are around 7 months old and getting dim, I run them about 8'' above my 18'' deep tank. About the salinity....I use two hydrometers which give the exact same reading every time,you wouldnt trust that?

I would agree with Snappy. I would go one step further and say good flow is an absolute must but, a random flow is realy what you should be looking for. Do the polyps on your sps sway back and forth, or are they always being pushed in one direction? I get mezmorized watching the polys in my sps tank swaying back and forth.
Keith.

Ok bought a new cam battery here is a picture of my last acro colony. 12hrs ago this beauty was perfect I awoke today to find this,notice how the polyps are still fully extended

50 - 100% more.

In my experience when you get a green skeleton after STN / RTN you have a nitrate-phosphate issue.

I'll test again ty,i've been testing at 0 i run 2 phosbans one with carbon one with phosphate media. Maybe my test is off can anyone recomend a more accurate version? P.S this is the first death where the skelly went green all others were white

another pic

ostreobium are green algae that live within the skeleton of living corals, Under nutrient poor conditions it causes no harm, but sufficient availability of nitrate or po4 it will grow faster than usual and will encroach on the coral and cause the live tissue to recede. The only way to control is to limit the nitrate on po4 levels

But what if NO3 and PO4 are already testing negligible to zero? I have the same problem. I tried running zeo to get rid of NO3 and PO4 .. didn't help. I run NO3 destroyer. NO3 is zero. It doesn't help. Acros drop dead after a few weeks. No obvious parasites. I wonder at times if it could be some kind of bacterial problem that once it gains a foothold there's just nothing you can do to eradicate it, because it's odd to me that out of 3 distinct reef tanks that I run, the same results happen in each of them. I used to be able to keep SPS - I can't anymore. Everytime I buy "test frags" or "test colonies" I get reminded within a few weeks that I am just wasting my money.

FWIW here are my numbers of the last tank I am trying SPS in. Ca 420, Alk 8, NO3 2.0, PO4 0.0, Mg 1390, SG 1.025. Source water is RO/DI. Water turnover is roughly 50x.

SPS can be one of the most frustrating and futile endeavours once it gets to the point.

I would have to agree with high alk in ZEO system, I lost about 450$ worth of SPS when i was running ZEO.

However someone already mentioned Copper? LFS will test for free.
Even if you never treated with copper it could have come from old life rock if you got it "used".
Or a penny could have been dropped exidentally in to your sump and or tank (Kids?)
Small wire cut dropped in?
Copper screw?

At any rate i would test for copper just to be sure.
If you still using ZEO get you alk down to recommended lewels.

Well it would seem my ka wasnt testing out properlly,the whole time i'd been running around 5ish. I jacked up alk in one day to 8...result my remaining 2 corals have healed over the skellies, and my latest test batch is holding strong,wish me luck lol. I dont run the zeo system by the way,I started dosing coral snow and sponge power in a previous attempt and was very pleased with it,but thats all I use. Mine is an algae driven system,along with my overcapacity skimmer and dual phosbans it seems to keep the nasties around zero. You can check out the survivors and my latest test batch in my album on here if you like.

Over what kind of timeframe did they heal over?? It seems really fast?

It was real fast,my pocci had approx 1/2inch of skelly showing at tips and base with a huge dose of sponge power approx 10drops for my total of 100g,it was healed in about 2 days the color is still a little light but the skin has healed over and polyps are out in the damaged areas. At the same time i dosed sponge power I also jacked my alk. I've used sponge power in the past for sick corals results were within a week there was noticable regeneration ,though I did lose those in an unrelated system crash (snail in overflow)
I've been dosing sponge power and coral snow the whole time,I just jacked up the dosage when the die off started,and dropped it when they began to heal.
You can see pics of how my 2 survivors look now in my album

Here they are here if you dont feel like hunting down my album lol

I did try looking for your album but couldn't find it .. where is it?

look up lol,I ended up posting the pics. its under public profile,statistics, when you click on my name ,my album that is

I saw THOSE. :p I just meant I went looking for your album as well but couldn't find it. Neither in the photo gallery nor in the photo forum so I thought I'd just ask where it is. :)

I know,I was just teasing lol but like I say click my name,go to public profile,then statistics. You'd think there would be an easier way....probablly is lol

In case you were wondering about the algae I was going for coraline but got this instead lol waiting for it to die off,the scrapes are test patches to see if it grows back so far it isnt...thank god ,It was from my system crash not a sign of a current issue,i left it to die off so my naso can graze.......thats my story and im sticking to it lol

I'll join in too! 1.022 is low, but it won't kill SPS like that, not even if improperly acclimated. Flow is too low, again, wouldn't do that. Alk of 10 may be too high for the Zeo guys to approve, but mine's that high at least, and I use Zeo, my corals are all fine. I'd guess not Alk.
Have you mentioned which brand of kits you're using? Have you cross referenced with someone else's kit?