water is Fresh water that is 99%+ pure. No nasty stuff in it. So if you have RO
water you are still going to need to mix it with a salt mix to get SW
. I would not buy water from an LFS
because I don't know how they mixed it or how old the filters are on their RO
unit. I have too much invested in my tank to trust someone else for that task. Also you should top off your tank with RO
water and not tap or SW
. There will be a certain amount of evaporation and only the water leaves not the salt.
2 months is not very long in the world of a reef tank. Becareful of adding a lot to a new tank as your biological filter may not be able to keep up with the demand! After you add the clowns I would not add anymore fish or inverts for at least a month. Your tank really needs to mature a bit. I definately would not add any more coral to the tank for at least a month and 2 would be better. Coral does not forgive as easily as fish can/do.