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I restricted or reduced a Mag 9 .5 and Mag 12 on freshwater tanks for several years and never had a problem. I decided to redirect some flow on a current Eheim 1262 I'm using now in saltwater. I think either way you're good. I put a gate valve on both the DT return line and the sump refugium return line so I can throttle either way. I like having the excess flow created in a little more power (moderately oversized) so I don't have to worry about not having "enough". I can always find somewhere to direct it.
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