Ok. Looked everything over.
The below is from my experience with csb, so not set in stone.
alk at 11 is a little high, especially with no3 at 5. Every csb I have had (numerous sellers) have always been in 7-9 with no3 around 10. How hard would it be to drop alk? Or raise no3? Just curious, especially about the alk part. High all is usually reserved for high nutrient tanks and quickly growing acros.
Can you post your light settings? Almost all of the csb I have had did better under a more white spectrum. For example, an a360we at 60% color and 95% intensity is where they would site in a 40b during qt/observation. The eye would almost all move to the highest piece of pipe, dead center of the tank wanting the par. Blue was only used for pics lol. The best looking one I had that made babies left and right was under halides, but we won’t get into that, as a whole other discussion
Now, I used water change water to feed that tank and it was 15-20 no3 and .1 po4 with an alk of 8-8.2.
In addition, the receiving at 85 worries me. Anytime I have received a nem in high temp water and there was waste in the bag, I had to treat them. Always ended up with an infection and always started out light then went to crap after about 2 weeks. So, if there was waste in the bag and the temp was high, I suggest doing a cipro treatment. 250mg per 10 gallons following the sticky by Orion in the nem/clownfish section should work great for it, if it is sick.
for removal, you can try manual removal or the nem cannon (there is sticky in the nem/clownfish section outlining it). The nem cannon will work, even for nems not wanting light, as it also blocks flow. If manual removal, just go slow and be careful.