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[geologeek]

Now i dont as of yet use RO water as my thank was originally fish only and i have a good water supply!

But i am going to start adding corals and the ilk but have a few questions about RO water!

Will i have to completely replace all the water in my system with RO before putting in corals or can i do water changes before and over time the water will be replaced?

Secondly i am looking into getting a 50 gal per day unit, but will not need anywhere near that amount so what do i do with the excess? does it just go to waste? from what i gather the units must be constantly run to prevent damage to the membrane, is this correct or do people just turn it on as and when they need water?

I know you can get units that do less gals per day, but they are expensive ( and by that i mean the LFS sell units that are about $1500 - believe it or not) where as the 50 gal i can get brand new from a supplier for around $110.

They also gurantee the membrane for three years, so i thought this would be a good thing!!!