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Agreed. ^^if you are making baffles or trying to hold a wall on an AIO tank, silicone will work just fine. If you are trying to build a tank or trying to hold pressure, silicone will not hold.
I made a sump with a glass tank and put acrylic baffes in, a heavy (but clean/neat) bead of silicone and it's VERY solid.. I used actual aquarium silicone, it's a bit pricey, but it's also convenient.

