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I have had a pair of 40's on my 180 since early April. one is dead silent and runs on else mode. the 2nd you can hear but not bad. it runs on W1. I bought the variable voltage power supplies for mine from Fish-Street. i have the W1 set to 19 volts and the Else set to 21v. I get the most awesome random flow across my 180. I want to put a Wp25 in my 10 gallon frag tank but im afraid it will be too much.
Do you think the 2 40's are to much for your 180?
I would like to try the 40 for my 120g, I already have one mp40 on one end of the tank, will the 40 be too much on the opposite end.

