Anyone have any thoughts, comments, or have experience re-using old AS?
Man, moving the tanks is a real pain for me. I respect you for having the courage to do this with 2 tanks at the beginning of the year. Hope it goes well.
I would also mix old and new. What I did is put the old at the bottom and the new on the top. This way it is just like a normal AS tank with finer particles (from the old AS) trapped in the bottom part. Even with all old grains it does not create a heavy mess. Most of it settles easily and you can vacuum or catch in a fine filter floss.
I would however avoid putting any mosses at this stage as they catch the dust quite well .