So I had a 10 gallon tank with a small common pleco and a fantail goldfish. The other day I found the pleco was dead, so I removed him and cleaned the tank. For the last couple of days, my goldfish was being very still for the most part, and looked like he could use some company. Today I went and got 3 giant Danios and 1 rubbernose pleco along with a 20 gallon tank to house the new additions and the goldfish. From what I was reading, I could do with another 2-3 Danios, but I'm wondering what other fish would pair well with the existing ones I have plus those new Danios. It doesn't matter if they would be another set of schooling fish, or 2-3 more solitary types of fish. Any help would be appreciated!P.S. - I just wanna know what types of fish will pair well with the existing ones. I know what sizes they need, and they are all relatively small. Will be upgrading in the upcoming future.