I have a 20g all in one Blue Planet tank which was cycling hut then the filter died. Rather then get it replaced with the same poor model, I decided to get the Fluval U3 internal since canisters are out of my budget and there's no room for a HOB!
The two things I was wondering are, can I keep the filter in a horizontal position instead of vertical near the top of the tank? And is it ok to use filter wool to replace the Carbon pads?
The two things I was wondering are, can I keep the filter in a horizontal position instead of vertical near the top of the tank? And is it ok to use filter wool to replace the Carbon pads?