Yeah, I will almost certainly change the stock filter out for a canister eventually just so that I don't have to look at the ugly thing.It's not necessary but it's nice. I run a small Eheim on my Ebi tanks and they're perfect.
Standard dual-sponge filters also do the job.
Because the Ebi is so small, it's often an issue of aesthetics, though, and they almost always look better without distractions in the tank.