Guppy needs schooling group?
Hi, I have various type of fish in my 20 g, and I am aware that some types of fish must have company, for example danios. I have one guppy, will it need a bigger group or will it be okay on its own? Will it be happier with a partner? I used to have 3, but 2 died unfortunately. Should I get him company or will it be happy alone?