I'm needing some good sound advice from folks who run the jebao rw4/rw8. I've got a 75 gallon, 48.5×18.5×21.125, and I need a very slow gentle sway action in it. I don't actually need waves, just a gentle sway. I should be upgrading to a 150 gallon, 48×24×30, in the next few months. I've never...