I highly doubt RO water had any contribution to a tank crashing, IMO it is essential for a reefs health to be using RO water not to say it hasn't or doesn't work for some people to be using well water but it is highly recommend by anyone who knows anything about SW tanks to be using an RO unit so one can have the least amount of impurities in the water as possible. So ill say what pretty much everyone else is saying and go with the ro/di.

---------- Post added at 02:21 PM ---------- Previous post was at 02:19 PM ----------
Quote Originally Posted by jimsflies View Post
The problem is that everyone's water is different. Short of spending a couple thousand on water tests, you don't know what you really have to start with. This is why the RO/DI is good...it starts us a zero so that the only thing in the water is stuff we add ourselves.
+ 100,000,000,000 jim lol well said