I threw in some anacharis in a bid to keep the water filtered. Theres some alfagrog and a piece of wood just for cosmetics. There's very little substrate. Its kept in the windowsill to promote algae growth.
I'm not sure what they are eating exactly, very occasionally I will add a teaspoon of water mixed with a tiny amount of baker's yeast.
Is there anything else I can add/do to promote their growth and make them a more nutritious snack food for the fish?