I think with the older Korilia's you can't run on a wave maker and people are still hung up on that. But I've read, from Hydor, that you can with the magnums. Now you can't adjust the speed but you can turn them on/off as many times as you like. I've been doing it for two weeks now and so far no problems.
If you're going to alternate go 7's but if you're just going to leave them on I'd go for 5's and do what you can to not point them directly at each other.
Edited by Sculpin - November 16 2011 at 11:02am