Try Tetra Blackwater Extract - it's designed for tropical fish, but
works a treat on aquatic Utrics and Aldrovanda. It's basically
concentrated peat extract with plant hormones and vitamins. I
can't comment on the effect it has on leaf colour, as I've only
used it on my aquatics. It also deters (though won't eradicate,)
algae.
Happy growing,
Peter
snail:Peter Cole,17 Wimmerfield Cres. :: mailto:carnivor@bunyip.demon.co.uk
Killay, SWANSEA SA27BU,WALES,UK :: http://www.angel.co.uk/flytrap/
vox:+44 1792 205214 :: Carnivorous plants and seeds for sale