I have one on my 40g frag tank dialed all the way down on the controller. All I can say is they kick a**. I haven't had any problems with it and can only talk good things about it. You may want to do a search, or read the manual, to learn what each color does for each setting.
My tank is currently a 120 4 ft length do you think if i use the mp40 on one side and 2 tunze 6045 (1800 gph approx) on the other ill be ok for a sps dominate tank till i upgrade for another mp40?
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