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Silicone won't adhere to that acrylic tube for any length of time. If it can be done, I would think Weld-On would be the only thing that might repair that. I have never repaired a crack that large, but maybe some of the acrylic gurus around here will chime in. I wouldn't waste my time with silicone though.
Your best best would be aquarium safe silicone. I used super glue gel for a crack on a turkey baster/feeder and that did the job too.
My thoughts as well, but I also do not have experience using it on such a large crack.