Bob–thanks for the reply. Just so I understand–you’re saying that there are titles for future articles in the listing of available articles, NOT an issue of articles that exist that for some reason have come “un-linked” from their hyperlinks and are lost in cyberspace? Thanks for all you and your dedicated team do. My immediate research has to do with how to best dose calcium without going the ca reactor route–my aquarium is in an open space between kitchen and family room (great for viewing from both sides) but the cabinet underneath is completely full with skimmer, sump, and small chiller. There is no room for ca reactor and it’s not the kind of thing I want on the wood floor next to the stand. The least unsightly of the bunch is the chiller, so I may be able to move that outside the cabinet if I can find a reactor that will fit in the space that frees up. Thanks again Ken