I've been doing the blue foam dart mod,and I must be doing it wrong. I swear I'm refilling more now,then when I was using the cheap polyfill the carts come with. There is the possibly that a shady aquarium store sold me the wrong foam,it didn't have a size on the package at all,but they swore up and down it was the size U.
Any tips or hints to get me back on the right track?
Any tips or hints to get me back on the right track?