That's a pretty common mod. The only reason to not bring the return up and over the rim of the tank is that it makes it harder to have a good screen top. It also doesn't look as clean, but the benefits of the Herbie outweigh that.
Remember to drill a hole in the return for a siphon break. This is typically a small hole just below the water surface. Some water will exit this hole, so make sure it is pointing down.
The product in the link you provided will work just fine, but you could also just use PVC.
- Brad
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