The painter also will love your water lettuce, anacharis, hornwort. They did a great job of eating my plants. A painter is 70% vegetarian. I have my three painters now in an aqaurium in my office. Their shells are about 6" long. They ate my 8" goldfish. So they have been out of the pond for the last year. They go after the larger fish on moon lit nights or during the twilight of the evening. Any small fry will be eaten. They can become quite tame. I've had mine for 6 years.