Working for William Sinclair Horticulture (which makes J Arthur Bowers products on my site) I think you may find you get some Ph problems with this product in the aquarium.

It should say somewhere on the bag that its not for use with lime hating plants as it contains lime.

I will check on the formulation at work tomorrow and see exactly what is in it and come back to you on this.

Sorry for the bad news, but you never know it may be a sales ploy to sell this brand as well as the others.

Andy