**NOTE** I actually meant Rena media. I was half-asleep when I wrote this.
I'm a relative noob and I'm updating my tank from a waterfall filter to a Rena XP2. I have to admit that I'm completely clueless about the whole stars and rings thing. I have absolutely no idea what any of it means. The link to that site on the XP series sticky is broken, so I have no way of finding out.
Could anyone help me? Thanks! ^_^



