Help! Salinity drop

[subnet88]

Hi,
The tubing came out of my float valve today and dropped my 90G's salinity to 22 ppm.

I have already lost a couple snails, 2 cleaner shrimp, and two peppermint shrimp. I have 2x BTA's( Shrunken) 2x Mini Maxi( Shrunken) and a carpet( Mouth gaping atm), two clowns and a yellow tang in there, that I REALLY dont want to die.

What is the best method of increasing the Salinity without stressing the fish and surviving inverts too much????