100 % Water change?

[McNasty]

There is no purpose in doing a 100% water change or even a 50 for that matter, if your tank has been running fine with np then just do a normal water change. Your substarte and rock will already be saturated with phospates and silica(think thats correct LOL) and doing a 100% water change will not change thos elvlv they will have to precipitate out over time.

[Matt]

A different sort of caution... make sure you break in your RO/DI well before you start this. The first fifteen gallons of water out of mine didn't taste very good.

Matt