20 litre tank

Hi all, I have always wanted to keep tropical fish and thought I would start small. I am looking into getting an 18/20 litre tank and I’m looking for advice as to wether this will be large enough to keep 3 guppies. I have researched online but different sources have different answers. I would...

So, I set up a 20 litre aquarium about a month ago. I have already have a filter and a heater. After cycling the tank for about a week, I bought a female platy and added to my tank. At the same time, I was given a four month old male platy from my neighbour, and added that to the tank as well...