I have googled and searched here in the forums, but I haven't been able to find a good answer. I am looking to buy a Jebao RW series for a 40 gallon breeder. Would a RW-8 be to much? If so should I go with a pair RW-4's? I would prefer having just one wavemaker in the tank if possible. Which is why I was thinking about going with the RW-8. If did get a RW-8 it would be the new PP-8.