Aww, Yuuie. :( I hope you feel better quickly. *healing hugs*
Yeah, plants for some reason really clog up a filter. I use a prefilter sponge on my Aquaclear 30 and it is yucky. The filter sponge in the Duetto 100 is just a nightmare.
For a prefilter sponge, just get the prefilter sponge for the Fluval Edge.
It slips right on the intake tube of an Aquaclear. It might slide a little but overall, it works and it keeps the gunk from reaching the impeller.
Silver, how did you do on your exam?