Id get a fresh jar, put your new filter media in it and create a DIY sponge jar.
Need:
1 jar
Media of whatever sort
A siphon hose tube slightly longer than the height of the jar.
Airline
Air pump.
Put your media inside the jar, put the tube in the middle of all the media, put the airline hose inside the tube. It works like a sponge filter.
I run a couple tanks on these actually.
My crayfish, betta, and fry tanks are run on these.
Id you already have the media and air pump, it'll be dirt cheap and easy to make.
Heck I even used an old intake tube from an AC filter to use my crayfish filter.
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