Originally Posted by peachesxo
So the fact that the older one is at the very top of its water level is normal? And the other is just so low because it's new?
It could be differences in the density of the filter media, the wheel causing back pressure, even someone at the factory using a cheaper impeller motor coil on the new one.
As long as the wheel keeps turning and you don't overload the tank, I'd not worry about it, just keep an eye on it.
Sometimes the rubber grommets on the ends of the impeller's shaft get inserted a little crooked and it can make em turn a little slower but there's no need to fidget with it.
The only real maintenance advice I have for the filters is to use scissors to trim away excess floss around the edges and at the bottom and top notches (input and spillway gaps) when you put a new media in. You're looking at about six to ten weeks maximum on the media cards if you get them at wallyworld.
I should probably get around to doing pictures of my flock of marinelands and notating them.