very interesting. I never realized this either. This may be part or all of my problem.

Not to digress here, but is RO the best bet for water? I cant justify the purchase of a filtration system for my small 12 gallon tank, but buying and carting around water from the LFS gets old quickly. Sometimes I question how "clean" that water really is anyway. I think sometimes the filters arent changed enough. I got a batch of water recently that I noticed actually smelled a little funky. What else do people use? In reference to the original post. Thanks.