I'm really like this little filter. http://www.petco.com/N_24_112/Fish-T...quariumFilters
I'm having issues with a commercial divider not working for my DTPK. However, I see pictures of other people's tanks with dividers, so maybe my guy is more devious.
(Seriously, I don't know how he is getting around it. I have not used aquarium sealant around the divider edges but it's the only thing I have not tried. It worked for almost two weeks and then he figured a way around it).