Tony I know I've described one potential plan of mine for my next tank. I want to attach vertical supports into my canopy that extend downwards into the water. Not sure what material they'd be but could be 2x4s attached to your joists above and then before they reach the water some sort of reef safe material. Acrlic rod. thick acrylic plate I dunno. This would go under the water and the Tunze mounts to it. You strap the cable to the support so it's barely in the water. This allows you to place the pump out from the bracing if you want.
I think the most appealing part is that there is no vibrations transferred to the glass. You could mount the 2x4s to the joists with some thick mat between to dampen those vibrations.
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