my fliter has broke,a fluval u2, so ive borrowed a brand new aqua one maxi 102f, which looks really cheap, anyway, ive put it togethe ,and there is 2 cartdriges with charcoal in, but i dont know where they go, the instructions dont even mention the cartdridges, they will only fit in filter if i take 1 sponge out, cant wait to get my fluval u2 filter exchanged at lfs ,as i think nit s agood filter,when they dont breakdown, im lost for ideas where the little cartdridge goes,any1 any ideas?

