Thanks for the positive comments!
Dark is the theme, and I was considering a vampire plec but they prefer acidic to neutral so I read; mine is naturally alkaline so planning a couple of Rift Valley syno cats, a couple of Raphael cats, and a male Dempsey (possibly a breeding pair) - their colour should provide strong contrast with the dark background/substrate.
not planning plants as I quite like the barren look of the tank, and the Dempsey(s) will likely demolish them anyway; dark marble angels...mmm I like that a lot! Will likely move the Dempseys into my next tank as they mature; must remember dark marbles, they would look great
Checked out the home-made celtic cross; excellent piece of work, though beyond my skills I think...my ebay special should look better for a little algae-coating hopefully