Disaster or is there hope

[ospouh]

Hi,

I just did an upgrade on my 10G reef tank, i was upgrading to 20 gallon as i changed appartments but as my luck always is, i can swear i had 2 bags of sea salt but only arrived at new apt with one and guess want

my salinity is too low, i dont know what to do the corals, inverts, fish are all in jars will they make it till the mornings, 12 hrs from nwo atleast before everything opens up

please answer asap....