They are much older than a month from the photos. I have three in my 50 gallon right now (don't worry they're small and moving to a 150 in a couple months) and I have a solid brown one which is juvenile colors and I've owned him over a year and a half or so now. Then I have one other that just finished changing he is all orange now. Then my other has been all orange for a couple months now. Plus all mine are around 1.5inches and they're ATLEAST two years old so that'd make a 1 month old around the size of a adult guppy. Correct me if I'm wrongThose are blood red parrots, right? Very cute fish. Wouldn't they be older than a month though since they don't look like they have juvenile coloring? Are these the fish in your 20g in your aquarium profile?