Hi ,

My tank gets a lot of brown (algae?? sustance) on everything especially the inside of the glass. WHAT is this and how can I reduce this???
I have a Eheim filter , why doesn't it filter it out, what kind of filter substrate do you recommand? I have circulary ceramic and a layer of (what looks like chunks of white sea coral), also a layer or little stones that look like their from a creek, but way smaller. What am I doing wrong so that so much brown stuff sticks to my aqurium and will the use of a Protein skimmer reduce this hazzard??

Thank you for now , I'll be back

Ralph Honsbeek