Haha...
@11f150, I just saw this and we're on the same wavelength!
A change is in order and you have lots of options – none bad.
Adding a single mp4o on the back wall around the midpoint of the tank would be the minimum I'd recommend and should be pretty nice, if it works with your rock layout.
All three on the back might be even nicer
since it takes them out of view.
This setup is not always easy to pull off depending on your tank – really nice when it works though.
Even better would be 2 more mp40's (three already seems like a big pile of $ to me) or a switch up to something stronger like a pair of these:
Turbelle® stream 6105's.
They'd be able to drop right into the spots where you're running the mp40's now, but have the extra kick and flow shape to run the whole tank.
Of course they also will give you LOTS MORE placement options than you would have with a non-aimable pump, so be prepared to experiment with different placements to see if you can find something better....maybe with the pumps hidden (at least partly) behind the rocks. Very possible with these pumps. It's nice that a pair will only set you back <$600 too.
I think a pair of 6105's is the strongest alternative to what you're running, but other pumps would also be worth considering, like the
Turbelle® stream 3 or even something from their non-controllable line of Streams, as well as Maxspect and Icecap pumps if those seem interesting.
Consider all of these suggestions either as replacements for or supplements to what you have.
Remember that an mp40 is good for covering about a 24" cube (not unlike their lights). Beyond that is pushing it....flow is generally too weak.
