well lucky they arnt big enough to do any real damage. hand feedings are funny. when my reds were the size of yours they used to pull prawns from my fingers. but then one day i realised that its a pretty bad idea associating your fingers with food!
Reddish gravel makes Pygos' color more vivid. Also this gravel is very good for the plants. Brand name: Aquaclay. If you want to get more info about the gravel, check out the following site: