Does distilled water have chlorine in it? RO water?
I am cycling my tank with Tetra Safestart... water is evaporating, and I would like to top it off.... it;s been 2-3 days, and you are not supposed to use prime for a week into the TSS cycle. can I use Distilled or RO water to top off? which one is better with NO chlorine... some sites say there is chlorine in distilled some say there is not... is RO water safer? Thanks.