OK. This madness started in mid April 2021 after an old school friend of mine gave me her small aquarium as she was fed up cleaning it regularly and burying dead fish. It was a 28 liter small tank. It had everything so I added Seachem Matrix (popular biomedia) and bought 5 small Danios from my LFS. They are alive and very happy in a bigger tank now. Why Danios because they are small so were suited for the small tank and they are very hardy. The first attempt to build the tank was total disaster, I gradually enhanced my skills ... pics for reference.