I have 2 FX150 in my 240G they work far better than the 4 MP40s I once had and better than the 5 Tunzes I had in this same tank.
I ran only one of the Gyres for a month or so while one of them was defective and it worked well.
A client of mine also runs 2 Gyres in a 350G.
I run both of mine at 100% and it is not too powerful and does a great job at getting every spot of the tank. I switch the settings up on them daily and dot run both of them in the same setting at once. Good random flow.
You will not need supplemental flow. As you can see i've tried pretty much all powerheads and I find the Gyres to perform the best. Build quality could be a little better but I have'nt had any issues other than one arriving defective.
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