fiz

plz help! I set up a eheim ecco series 2234 external filter 4 weeks ago,but the inlet and outlet pipes have become very dirty with a dark debris. have i done something wrong or is this normal,it's a 4 foot 35 gallon tank which also has a internal Fluvel 4 filter.thanks

Isabella

It's inevitable that your filter tubing gets dirty. You need to clean it every once in a while. You can get special brushes at your local fish store that reach deep into the tubing.