People already said it, but the Fluval edge sponge pre filters fit well on that filter intake.
Some are looser then others, I had to put a ring of airline tube into the bottom of one sponge so it would snap to the bottom of the intake tube.
What it looks like in a tank. This is a 1 gallon version of your 5 gallon, spirit was in temp
I like those sponges because they aren't as ugly as my aquaclear coarse filter foam. All my fish love to slap themselves on the side of the sponge with all their fins spread out and let the sponge hold them gently to the filter as they sleep. The biggest Aqueon bow tank I have is 2.5 gallons though.
I did manage to cycle the 2.5 gallon with the aquaclear coarse foam, I am not sure if I can with the fluval. (I tend to abuse the sponges bacteria a bit during water maintenance.)
Love your 5 gallon. I will have to go look and see if your big tank is in your profile albums :D (You're making me want to go get one of those 5 gallon bows...... evil, bad.... I don't need it. I have plenty of other aquariums atm LOL)