I use both excel and TPN+ in my shrimp tank, and they are doing well and breeding well. However, I've read that shrimp don't do particularly well long term in a tank with ferts, but I've had no problems.
No problems with Shrimp either, just head over to UKAPS, I'd wager that most members have shrimp in one of their tanks and most dose considerable quantities of Ferts etc.
Thanks for the info Ben, Will be acquiring a few from a member on here soon and would like to add them to my 55 litre planted with my Cardinals and the 3 Snails.