Jens Kallmeyer,
Beautiful tank and thanks for posting those pics.
I've been contemplating creating a biotope of this kind for quite a while and your tank is quite inspiring to say the least.
Questions?
How long have you maintained this NPS system?
Have you documented growth at all?
Do you turn the skimmers off while feeding or skimmer is run 24/7?
Have you encounter any undesirable algae growth by the always almost present foods in your water column?
Do you use carbon and/or phosphate reactor in your system?
Could you be more specific about the Tropic Marin foods you use?
Sorry about all the questions just trying to learn.
Thanks,
djfrankie