Just as the title says, curious on how long your rolls are lasting. I have my ReefMat 500 on our 90-gallon tank. Seems we're changing rolls every 2 weeks currently... I was thinking they'd last 5 weeks at least from what I had read. So now I'm just curious if anyone else uses rolls this fast or is it we just have a very dirty tank? I don't think it's that, tank is pretty clean imo