This bit of very important info was missing from your previous post which made it sound more like you had a tank full of RO on a drip and were doing nothing to remineralise with no I'll effect, in fact thought you buffer with coral gravel an monitor....many people would have read your post and thought you could just keep rays in a tank full of RO and have no risk, we must remember that many people read our threads with no knowledge and hence people get the wrong idea....such as thinking the amazon is Barron, pure water.