Modify Fluval U1
I'm running a U1 in my lil guppy tank, and was just wondering if anyone had ever modified the filtration section of their U1?
Currently its just a single sponge in the filter house above the impeller.. But I'm thinking about cutting the sponge in half and having the bottom half of the filter house as bio rings/balls, maybe carbon in a small bag...
Has anyone ever done this? Or would anyone advise for or against doing such a tweak??