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 have one of these in my 36. I took the inside cartage and ripped the filter off and replace it with pol-fil. I am in the mode of slowly removing this from my tank (yesterday i took the cartage out but it still running) to see if my tank still needs it. I have to say it worked well in my 36.