Okay I guess I am on the wild side I like Scarlets and Hawaiians, and I do have the others in my 300 but if you can find Hawaiian and Scarlets you are good to go(both in my my 29). If you add 10 scarlets, a year from now you will still have 10. In my 40 I only have snails and they have done an okay job. The big thing is running GFO to keep phosphates down, I had to learn the hard way on my 300.