Need Help Quick, think my blenny is dying

[Slick Fork]

Well, I'm too late. Ran downstairs and he was wedged in the rocks.

Parameters:

Ammonia 0
Nitrite 0.1
nitrate 5
temp 26 celcius
salinity 1.027
ph 8.3

I watched him eat last night. I had been feeding New Life Spectrum pellets as well as freeze dried brine shrimp, last night they got new life spectrum plus "ocean nutrition formula two marine pellets"

The change in appearance and behaviour happened almost overnight. Last night I watched him eat both the NLS pellets and the new stuff. He was social and had energy.

He did not look even remotely like that picture last night. He was a lot closer to the bottom one I took 5 or 6 days ago.