I don't think silicone bonds well to acrylic. It's okay for baffles or overflow boxes that aren't under alot of pressure but I don't think you would want to do a mixed acrylic and glass tank.
That being said, I thought I had seen a company doing glass tanks with acrylic bottoms to facilitate drilling for drains, returns. closed loops etc. But they may be using a special silicone or adhesive to do that.
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