works. It has already been filtered and it's safe to use in making your salt water. You don't have to use RO
, but if you use anything else you have to use a chloride remover. Not to mention anything else will have all kinds of other things that will encourage the growth of algea. It's easiest to use RO
The point we are trying to make is this, it is BEST to let the tank establish completely before adding anything. It is the safest way to introduce fish or coral or inverts. If you add them too soon, the bacteria may not be able to keep up with them and toxic levels of nitrites or ammonia could harm them. Even if you cycle the new tank, you will still want to add the fish slowly as well. Just because there is enough bacteria to say it is cycled, doesn't mean that there is enough bacteria right off the bat to add 12 fish( just throwing out a number).