omg thaitybetta... We have a bit of a stigma about that certain youtube person. The verbally abused a very well established breeder on here for their method of breeding. that story is here---> http://www.bettafish.com/showthread....ht=Thaitybetta
As for the filter, its a simple sponge filter. I have one in my baby tank right now. They work pretty well I like it. And its a lot easier than he is making it out to be. Get a sponge from the store (preferably one without an abrasive side). If its to big cut it to fit. Once cut take a wooden pencil and make a hole on one end, don't poke it all the way through. Get an air pump, a control valve, some air tubing, and a few clips with suction cups. Cut your air tube into two sections; one end shove into the hole in the sponge, the other attach to the air pump. Connect those with the control valve. Put your clips on the hose and suction cup it to the side of the tank. Plug it in and adjust the valve to a setting your comfy with.