skimmer help

I have had my tunze 9004 DC unit on my tank for weeks now and still not skimming, and I think something is not right with it. Maybe someone can help guide me If I install the skimmer to the watermark on the back of the skimmer it will not generate any foam/ oxygenated water inside of the unit...

I’ve only cleaned this in tank nano skimmer once since I set up the tank 5 months ago. Ever since cleaning it that one time, algae has been steadily growing in the body of the skimmer, and I can’t get to the inside to clean it. I tried rinsing it with vinegar, but that did nothing. Does anyone...

Hi friends! I’m planning my reef tank (long ago had a 10g nano reef for 3 years) and am now hoping for suggestions for brand and size of skimmer. My current plan: -60-80g tank with sump and refugium housing fish, soft corals, shallow sand bed, clean up crew - have 2 AI-16 lights - have BRS...