heres the deal i bought my tank and it came with a 300. i looked for a media or the filter i couldnt come up with anything. i think they stop making it for some reason but i plan on adding either a emp 400 or ac500. i was wondering if a peng 350 filter would work for it or if there is one made for it. i was also wondering does anyone know where they sell an extendor tube. the part that attaches to the 1" tube that goes into the water that sucks the crap up(dunno what its called) but i am missing that part just wondering if anyone knew where to get one.