Perhaps some of you will find this interesting, this is from Tetra: Date: Wed, 06 Jan 1999 13:25:23 -0500 From: Consumer Relations <CONSUMER at tetra-fish_com> Add to Address Book Subject: Re: Tetra Feedback The NPK is 1.35%, 18%, and 18%, according to some old notes I have, but I suspect it may have changed a little. Not much though. Regards Bob