I just got the mp40w about two weeks ago. I have not tried any thing besides the lagoon mode the pump is awesome. I might try the reef crest mode since people are saying good things about it. This was money well spent i got to take out my PCX-55hp and two Koralia 4's and this does a better job than all of them. But I think it is a good idea to put the little filter that goes around it on. I lost a tang at the beginning of the week without it on. I dint think it would have happened if it was on.