IMO DO NOT use any amino-carb crystals. They are a mixture of carbon (don't need it) and ammonia chips (don't want it). The ammonia chips will remove ammonia from the water. Some people including myself believe that this "shortstops" the beneficial bacteria and results in a bacterial colony that cannot handle the full ammonia production of the tank. When the ammonia chips wear out (which all chemical media does) you could get an ammonia spike until your bacterial colonies catch up.
Does your wisper filter have a second insert that is a thin black sponge? If it does, this is where your bacteria are supposed to be housed. Never replace this or rinse it in tap water. IMO it's not enough surface area. Save yourself a ton of time trouble and MONEY and get a filter sponge that is manufactured for Aquaclear/fluval/whoever that fits snuggly in the space that houses your biobag. This, you can just take out during water changes and rinse in the dirty water bucket to remove the gunk. Then pop it back in. You've removed detritus, preserved 100% of your "bio-filter", and saved yourself some cash.
BTW I do not use ANY form of chem filtration on my tanks. Mothernature/God/Gia has provided us with everything we need to keep perfect water quality in the form of our prokaryotic friends. Trust them, they know what they're doing. I actually run all but one of my tanks on simple, elegant, effective sponge filters (most of them running off a single air pump to save on electricity)