What freshwater fish eats insects and snails and grows to 16 inches in length?

The clown loach grows to over a foot long, but usually stays around 10 inches. You will need to keep multiple clown loaches in your aquarium to keep them happy.I don't know about insects, but I think many fish will eat insects if they have access to them. All botia species of loach will happily eat snails, but all are gregarious and like to be in groups. So, if you are looking for a single 16" fish that will eat snails and insects, the botias aren't for you, but they will eat snails.