Well I am going to order some new AM 600 from the place I usually get my GFC. For what ever reason AM 500 is not on there sheet anymore so I would have to get:

AM 300
AM 400
AM 600

So I guess I will just have to try the 600 for now.

Does anyone think I should just stick with GFC instead of AM 600?

Or go with the AM 400 instead?

Just want to get them started on this better food to see if it will make much of a difference.

Thanks