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I wouldn't call a Mag9 small for a 130G with a 30G sump. Using the 3 - 5x rule, thats 390 - 650 GPH. A 30G sump is not very big, so I'd stay on the low side of that. Close to 400 GPH is a lot of flow throgh a 30G sump. Yes, you need 1.5" plumbing to get the full flow from a Mag9. Most people dont, and few even realize this. Most plumb it with undersized plumbing which dramatically cuts back the flow. Same as putting a ball valve on the output. With 3/4" plumbing, it is in the range of flow where it should be. If it has 1", it would be on the high side. 1.5" definitely too much.
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