http://www.bio-web.dk/op/pdf/TAG_2002_15_7.pdf

I have long rejected this hypothesis that allelopathy plays a significant role in aquariums in regards to plants and algae.

Many seem to still think it's likely.
But few experts will say that it is, I've proposed numerous experiments one might do to show this for themselves.

The above article was in TAG several years ago and we(mostly myself) pretty much beat the idea into the ground.

Ole will be at this years' AGA event BTW.
I have some questions for him too:-)

Regards,
Tom Barr