What brand of Ferts are you using? I agree on made for Bettas is usually trouble.
i honestly hadn't thought that one through....both of my planted tanks are very well stocked so there's always been enough fish poo to keep my plants growing like crazy. i hadn't considered that with just one little betta to make poo, i'll have to supplement the plants' nutrients :)
So remember, when you're feeling very small and insecure,
How amazingly unlikely is your birth,
And pray that there's intelligent life somewhere up in space,
'Cause there's bugger-all down here on Earth.
Loki/Grendel/Gail/Beowulf/Camilla/River/Bathory/Arwen/Lafayette/Deb/Jack Skellington (soon)