I picked the one where they only need to eat a couple times a week. A fasting is okay every now and then or a weekly fasting but for the fish to be eating only about 3-4 meals a week is terrible. And a lot of people would probably give them to little even for a regular feeling or start to feel bad, think their fish looks hungry, and go overboard with it. My second choice is the cold water one. Even if someone doesnt know that they are tropical fish you would think they would give the fish warmer water if it feels too cold.