Ehm.. my german is not that good..so..i will give a reply in english! I just moved to another home.. so i had to transfer my 260liter aquarium to my new garage cuz the livingroom is not ready yet.. (to make some pics from my aquarium in my garage is a bit embarrassing ) I will as soon i have my sh##t in order..
The black out of 3 days (with a combo of H202) helped a bit but unfortunatly it's coming back! I cleaned my filter and hoses very well.. long brown threads are appearing again..
This saturday im doing my 50% water change en maybe again start adding H202 in combo with my uv filter.. who know's.. miracles do happen and it will stay away this time..