I have a 48" and 1 dialed down mp40 is a lot. It also gives me super heavy flow on the one side but light on the other. When the 25s come i am going to try one small one (probably turned down as well) on either side and try to even my flow throughout.
Depends on what you have in tank i would imagine. As on my light flow side i have some lps that like not a tonne of flow and it seems ok except for i started sticking some sps on that side as well and now i am wanting it a bit more even throughout.
Hope that helps give you a point of reference to decide.
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Nick
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