Stuart R Scott wrote: >Bob, I got lucky. Scrubbed it real good and filled it >with water and 24 hrs later, it's still holding. It now >holds a betta proudly swimming in his new digs. Slate can be quite a strange stone as its made of layers. Its not totally water impermeable, though it is less permeable where its layers lie horizontal (and the water is above, or below). This is how it was traditionally used as a building damp course before the days of bitumised paper, and plastics. But, it will still have some permeability. So keep an eye on your tank for a subtle seepage, which will be less than a drip but will probably be present. Waterproofing slate may have come on a bit these days, but the old Victorian slate tank I had, had its base sealed with some sort of patent wax originally (the constituents of which I really don't want to think to hard about). When I decided to used the tank I placed a piece of glass over this and sealed it post insertion from the inside with silicone. Scot ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!