SG is fine for where/what your doing at this point. work on getting it to and maintaining 1.025. your right about not adding the salt directly to the tank/fuge. it can be very caustic at first and can kill anything that comes into contact with it. basically playing russian roulette with anything in your tank if you do it. personally i get the 5G bucket and powerhead going for 24 hrs with the RO, then add the salt and let it cure for at least 24 hours before i add it to the tank. some people will skip the 24 hour aereate time before the salt is added. i have done so in emergenices from time to time also, but the extra time doesnt hurt.