I am no expert, but if the stockman pipe (backup or failsafe) can handle the return flow of your return pump on its own, then I wouldn't think there is an issue, unless both plug. Now if either one plumbing, CAN'T handle the return flow on its own, then yes you would potentially have a problem.
But again, as I stated, I am no expert here.
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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