Why the hell do my sps keep dying

[martym]

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

[Doug]

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

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.

[dabandit]

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?

[Haloreef]

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.

[dabandit]

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