No pet/kept bird (or finch) should be left to live on seed alone. Birds and finches don't live off just seed in the wild - they spend their entire days gathering food from a variety of sources. So, if you are genuine in your care towards the birds and finches in your care give them a large variety of foods. Never leave a bird/finch to only survive on seed. Birdman Dad is going to show you the extra foods he gives his birds and finches each morning - vegetables, fruits and soaked seed.