Anyone recommend any cheaper options of UV for a 140 gallon tank. Do those pond uv do the same thing for a reef tank or is there a difference.
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Not sure what "cheap" is in your opinion but I have been running an Evolution Aqua 25w for a couple of years with good results on a 135 gallon tank.
White unit on the wall to the left of the tank.
They're dead cheap although I am unsure whether they are available in the US.
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Aye. They are. Is there a question in there?All your electronics are mounted right above the tank?
OP, all UVs work the same, quality of materials is different. I would use o recommend only high end UVs due to plastic degradation, however that happens with all units it seems and doesn’t appear to be a problem as far as the inhabitants are concerned.

No issues there! We all gotta work with the space we have and find the best solutions considering the challenges that that presents, right?

