I would recommend thinking external. Submersible pumps add heat, and the bigger they are, the hotter the run. Iwaki makes quality pumps suitable for a 125
that run pretty quietly.
i have a a sicce syncra silent brand new in the box if your interested.. asking 100. pump is the most reliable pump out there and its dead silent.. not sure how far your head height gonna be but thought i would throw it out there. or i have a mag 7 used..
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