Miss Wiggle
Practically perfect in every way
what colour sponge do i need to use? i have black, green, blue and white. all do diff things apparently.
erm unless they've had something specific added to them to make them do something else i can't see it. i've always thought that's a bit of a marketing con
some filters will have different coloured ones that are different thickness and density to go in different places in the filter, this is to catch most of the waste at the start so the sponges afterwards can just be used to house the bacteria colony.
for just 1 betta it really doesn't matter cos he won't produce that much waste. just get one of them that's been in the filter a reasonable amount of time but isn't really old, chop it up and get it in the new filter. just remember it needs to be kept moist with tank water all the time so you've gotta do it fairly quickly to stop the bacteria dying off. but as long as you have everything prepared before, take it out, cut it, put it in and plug the filter back in you'll be fine. just don't go make a cuppa in the middle of it

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