Folks, if you've recently upgraded or renewed your annual club membership but it's still not active, please reach out to the BOD or a moderator. The PayPal system has a slight bug which it doesn't allow it to activate the account on it's own.
I am using Aquavitro Salinity. I switched when I moved to the big tank. Previously I was using Trop marin pro.
Honestly, I do not see any difference :)