i have to agree that i don't think its the pump. I used to run an eheim 1048, and get a shaking monitor. I haven't run watercooling in 9 months, and I still experience the same problem.
What I discovered was that I have a 27 year old refridgerator, that has an energy saving device on it because my stepdad is too cheap to actually buy a new fridge. It snaps on occassionally and the monitor picture violently shakes. Even when it's clicking the compressor on, the god damned thing shakes a little bit anyway.
So rather, it's your power, not your pump. Gets VERY annoying doesnt it ?
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