I went with all hard plumbing, partly out of necessity - I tried to drill the sump, which the manufacturers website said was not tempered, and guess what? Removed my baffles and went right out and redid the sump, but I wasn’t about to risk it again. Pumps went inside the sump and I hard plumbed the returns with lots of unions. Noise is negligible and cannot be heard at all from viewing room. Very happy with pumps. Tank manufacturer, not so much.
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