I have two sponges (one full, and the other 'half' the normal width), poly-fil batting for finer particles, and finally biomax that came along with the 500.
i have sponge , carbon , bio-max .
does anybody have a problem with the media basket creeping up,
only on the side opposite of the motor ? plus i replaced the impeller but the motor is still very noisy probably need to replace motor as well ?
2 litres of matrix
2 bags of biomax
250 grams purigen
sponge
all squeezed in there but it fits and keeps my 75 over stocked crystal clear and ammonia down.