you can change the carbon section for a bio sponge.ok now my head hurts!![]()
I have a fish r fun 90l aquarium that comes with a built in filter that uses bio tube thingies, carbon and what looks like a really crap sponge.
It has 3 compartments, bio things either side of a big bit with carbon and sponge. stupidly i thought a filter was just a filter!
Can i change these for something else? like the carbon for example, swap it for sponges or something? Oh god i am soooo new to this, thought i'd done my research but....
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