I used to use the Tetra stuff, I switched to prime because it was more cost effective. Plus should my tank have problems with ammonia and nitrite, like recently my filter was destroyed by a bio filtration "safe" medication, I can keep my fish alive while the cycle happens.
I always thought that after a water change my water was blue when I was using aquasafe. When I switched to Prime it disappeared, I don't know if it was my mind playing tricks on me or what but the water always looked blue. Now, with Prime, it just looks like water.
nada...i just read every single thing again on the bottle carefully, word for word, very slowwwwly. it doesnt say. i am positive. all good. no big deal. i must have a different label on mines. i just bought mines on Saturday. 2 days ago.