Yes, that is what I thought. Thanks. I already own a Seio and would be handy if I could use a wavemaker. However, this particularly Seio can't be used. To buy the wavemaker and pumps made by Rio(Seios, at least two) is a major investment for my 40 gallon cube. Since this thread has already been started, I would like to hear from others on solving flow problems in a nano. My objective is to grow SPS.