I have an older AC filter when it was a "300". It's now produced as the "70". The "300" was filtering a glass aquarium. I tried attaching it to my acrylic aquarium. The opening is fine but the 1" lip is too wide and the filter won't hang. When the "70" (and other models) were introduced, did their dimensions change to accomodate wider hang-on areas?
Thanks!
Thanks!