I was wondering is there any way to setup a HOB filter to hold some cheato. I have the HOB running with no media just helping circulation, 55G SW. Ive read some post where people have it in their sump and it does miracles for nitrates. Only problem is, I dont have a sump. My nitrates aren't exactly high, but i figured the filter could be used for something good. Its an emperor 400 so i have a good amount of room in the back to work with. Any suggestions or links would be appreciated. BTW where do find cheato?