Sorry jumping in with a tangent, but I recently got the API superclear HOB filter. And I love it! Like noticeably more than any other filter I have had.
I still like my Fluval Aquaclear 70 on my bigger tank, but for my 30g the API superclear, with bio-chem zorb, and Purigen has been incredible! You can adjust the down stem to any level, adjustable flow rate, and it has a calendar to remind me to change the cartridge. The down stem also has a surface skimmer.
I replaced my Tetra whisper with the API superclear.