the tube on the right is the intake tube. the one of the left is the output. had to take that piece off my fluval and fit it on because there was so much water coming out it was blowing sand everywhere
well i just got the filter working so i'll know soon!!! so far it looks to be working great, but as for how well the bioballs work, i dont know as i can't see them in action! they are supposed to work really well though, have a really large surface area