What caused my stylo to do this

[Susan Edwards]

Both my purple stylo and blue montipora digitata have bleached out. Lights have been at 90/40 since early July when I raised them higher. RS 160's. Is it flow? Everything else is great, including 2 other of the digitatas. The 2 were touching, did they try to kill each other?

I have 3 days off next week if it can wait for me to frag this.

 

[Susan Edwards]

adding pics of my tank from 8/21 and you can see the stylo in first photo

 

[Spare time]

Could you list the numbers?

 

[Susan Edwards]

alk 8.65 Usually at the 12am test, alk drops to around 8.1 and then back up during day
CA 468
Mg 1558
Via Trident

8/30
No3 .2
PO 4 .17

I finally have some po4. Trying to feed heavy to get more no3

Salinity a tad high as my apex atk pump quit so I've been manually dosing but that has only been the last few day to a week. No more. Also dosing reef flux. Day 14 today. Will be another 2 weeks prob. Also had cleaned all my pumps (mp40 and RS 45's) but it's been in that high flow since beginning. The other 2 digitatas are good, encrusting even. I also have 2 frags to trade that look good, and a frag of the stylo looking good.