Acrylic expands when it is submerged in water. So it can crack the glass on the sump. That is why it is always best to use glass baffles in a glass sump. That & the baffles will eventually fail because the silicone will eventually pull away from the acrylic. Silicone doesn’t bond to acrylic well at all. U can lay a bead of silicone on a piece of acrylic & let it cure & it will peel off by just using your fingers.
I also agree with them on the thickness. I wouldn’t use anything less then 1/4” on just about anything we use it for. That goes for glass & acrylic
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