Brilliant thank you , are they community fish?It's a rainbowfish, a Melanotaenia, but it's not clear enough to see what species.
I’m getting a new tank tomorrow and they also come with it and an Oscar fish but I believe they aren’t community fish? I just wanted to make sure before I put them in with my fish that they wouldn’t kill themYou have the clearest view, as I hope you already got them. You could work through this to see what you see:http://rainbowfish.angfaqld.org.au/Melano.htm
They are large, so they can dominate a tank. They have small mouths, so they tend not to eat smaller fish, but they will boss them around. There are a lot of species, but most are okay in a community if the tank is more than a metre long along the front. They need room to swim.