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 run one on my 120 with low flow more to burn up algae than anything.I don't think they work too good for parasites but I can't prove that, never had any.KNOCK on wood... :P