Some of you guys got this poor person all over the place. First of all I've had 7.6 to 7.8 on my sps dominated tank with thousands of dollars worth of sps from RR, CC , etc etc etc. PH isn't her problem right this moment. PO4 is way to high, mag is to low if, you get up up to around 1350 and stabilized ur KH will thank you. PH can be due all kinds of variables, fix your MG and po4s, don't worry about anything else. Where's your triton results? Are you skimming wet or have no skimmer can't remember.
This is going to be long winded, even worse, not productive or helpful in any way. So I apologize to the OP and everyone who's trying to help her figure this out.
First,
@nl5882, phosphate levels of 0.5 are not going to kill every invert she puts in the tank. I'm glad you got yours in check, but just because that was your problem, does not mean it's the cause of everything remotely similar.
Second, ph is an issue (at very least, a side effect of whatever is causing the problem). It was lower until her last wc, which brought it up slightly. I know 7.6-7.8 isn't highly abnormal, but with the accompanied high alkalinity, there is definitely an underlying problem that should be addressed.
Low magnesium could absolutely cause the low ph and high alk, but we're talking severely low levels in order to have this large of an impact. It's not much lower than natural seawater. If low magnesium was that big of a problem, the high alkalinity and a calcium level would cause a blizzard of precipitate in her tank. 1140 is low, for a highly dependant system, but not for one with near zero demand for it.
I can only speak for myself, maybe others will agree, maybe not, but it doesn't matter how much you've spent on coral, or where you bought them from. It's the same logic as saying "I drive a nice car, so you should listen to my mechanic advice." It's not the first time you've mentioned you're pricey collection, and I fail to see how it pertains to this thread at all.
I know parts of this are childish, but your initial comment was offensive and implies that we don't know what we're talking about and we're just giving bad advice. With how involved I have been, I take this personally, and I feel that other members should as well. The only bad advice I've seen here is telling her to ignore everything until she gets po4 and mg in check.
Everyone involved is trying to help, you included. A lot of members who have contributed to this thread are well known, reputable, and trusted members of R2R. I have not been a member for long at all, but I definitely don't lack experience and I wouldn't offer my 2 cents if I didn't feel like I could help the situation.
If po4 ends up being the cause of all this, then I will sincerely apologize, but until then, try to offer more help than just your handful of posts about your jf homewrecker and how you're positive the cause and solution is phosphates.
