minimum tank size would be 20 gallons for a lawnmower and they will eat algea and if they dont you can feed them like sushi seaweed sheets
mine eats pellets
Minimum would be 20-30 gallons, and they eat algae for the most part. They are known to be finicky eaters at times, but most should except algae, seaweed, nori, and possibly pellets. Mine loves blackworms.