I crumble up the harlequins' flakes into a bowl of tank water, and while Puffy is eating his 3 pellets, I suck up the flakes in a turkey baster and sqeeze the food slowly out. Whenever Puffy comes around and trys to chase the harlequins away to eat their food, I gently poke him with the turkey baster, and so he's learned to leave their food be while the turkey baster is in the water. My harlequins have now become conditioned to come to the turkey baster for food, and Puffy has become conditioned to avoid it.
I don't think the minnows would be a great idea in a 5 gallon tank for the same reason as the tetras. Five gallons is too small for a shoal of fish and your betta as well.
Last edited by JKfish; 07-24-2010 at 10:09 PM.