advices

Yeah just wondering is normal like this and plus is my green acan okay and me alveopora too?!

Long story short, my mum, on her way home, saw some fishes and decided to buy it. We bought a 5L tank and a water filter for the fishes and I think they are not comfortable as 5L is small for 2 pipefish, 2 clownfish, 3 other fish that i dont know the name, and a ribbon eel. Its just a few days...