The plantguild has "ties" attached to suction cups. Will hald almost anything.
http://www.familychest.com/plantguild/html/holdfasts.html
Of course one proble is if you don;t want your drift wood next to your glass or half hidden under your substrate, of you all ready have your substrate down!
http://www.familychest.com/plantguild/html/holdfasts.html
Of course one proble is if you don;t want your drift wood next to your glass or half hidden under your substrate, of you all ready have your substrate down!