Hi there, my boyfriend and I decided to get an aquarium for our little flat to brighten it up with life a bit and ended up ordering a 21litre aquarium with a starter kit. We both don't know much about fish and are currently trying to read as much as we can to do everything right. We initially wanted to get two little goldfish, but as I am browsing through the net I found that our tank is too small for them, so I wanted to ask if someone could advice me on which fish would be suitable for this size aquarium. So far I really liked the Siamese Fighter Fish and Platies. Since we are not experienced in fish keeping we would prefer to stick to coldwater fish for now. I'd be grateful for any advice, thank you!