So long story short I've got a few tanks 1 had a problem and now the salinity is low and I need to raise it..its a 60g and the salinity is .18 I know that is really low and I'm working to fix it..all fish and inverts are alive happy and healthy including snails..I kno dramatically increasing salt could harm the tank so yesterday I emptied about 5 gallons of tank water in the bucket and added the dose the bucket says (1/2 cup for 1 gallon)(instant ocean reef crystals) and could have possibly added a additional 1/2 cup can't remember anymore..so added my fan and heater, mixed then added straight back to tank and basically nothing it maybe slightly raised it by half but it didn't even raise it to .19..checked back a few hours later after tank had time to turn over a few times and still nothing..since I can't really listen to the back of the bucket how much salt do I need to add? How often, every few hours or once a day?..don't want to kill any fish so any advice helps