Power head flow

[CaptainFishFingers]

Hi all, on the one side of my tank the power head seems fairly powerful but the other side the power head is weak it’s just came to light that I need both to be flowing at the same rate, my tank is 150gallons and not sure if I need new power heads and if so any recommendations?

 

[Idoc]

Remove and soak/run in a citric acid mixture for an hour.. then take apart and clean. This usually helps speed up a pump that is gradually slowing down.

You can also soak in vinegar/water mix as well... but I've had better luck with citric acid and it seems to be a little more gentle on the pumps.

 

[Mikedawg]

+ 1 on citric acid. Assume your power heads aren't adjustable?

 

[X-37B]

What brand powerheads?
How long have they been running.
Pics?