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I use regular PVC for everything except a couple of ~12" pieces of vinyl (or silicone) tubing between the pump(s) and the pvc or bulkheads to minimize vibrations. IME, soft tubing has the potential to kink, reducing flow. It will also grow algae on the inside if it is exposed to any lighting, further reducing flow. Another big plus to PVC is that you minimize (or eliminate) the need for barbed fittings which greatly reduce flow. That can be overcome by using oversized fittings but that can become rather cumbersome.
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Current Tank Info: 120 mixed reef with 40b sump, RO 150 skimmer, AI Sol Blue x 2, and a 60g Frag Tank with 100g rubbermaid sump. 2 x Kessil A360w lights, BM curve 5 skimmer
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