Sick Clownfish

[Melinda01]

I added a clownfish to the tank about a month ago. He was eating and swimming around like I would expect until a couple of days ago. Since then he is hovering just above the sand, will not eat, and appears to be gasping. I also just had a newly added cleaner shrimp (added 4 days ago) die today. There are no visible signs of illness (no white spots, difference in color, etc). Any idea what may be going on?
Parameters are
Nitrate <5
Nitrite 0
Ammonia 0
Ph 8.2
AlK 9.9
Mag 1290
Ca 430
Temp 75-78 (varies with the lights being off or on)
Livestock

Clownfish
Purple pseudochromis
Yellow watchman goby
Half black angel
Yellow tang
Pajama cardinal

5 peppermint shrimp
2 fire shrimp
1 cleaner shrimp (now)

3 blue leg hermits
10 red leg hermits
2 tuxedo urchins
1 long spine urchin
A few snails

72 gallon tank with 20 gallon sump
Protein skimmer and bio balls
100lbs live rock and live sand
Tank has been up and running approximately 5 years
Dose 45 mL vodka daily because I was having nitrate issues but they have resolved
Change 25 gallons weekly with 6 stage rodi reading 0 tds

 

[MicroPico]

Salinity, specific gravity? Double check by two different means...in case one is off.

 

[Melinda01]

1.025 SG. Only have the one refractometer but made sure it was properly calibrated just the other day.