This is what a month of cinnamon does to a vivi mini nova and 2 weeks to the
acrylic grommets on a glass tank.
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I just looked at your picture again of the melted "grommet" and looked at one of my own tank's acrylic cap. The tank that this happened to is one of OCD's, correct Ocelot?
From your pic, it initially looked to me like there were silicone grommets being used between the endcap and cartomizer, and that was what melted. I mistakenly thought the little piece that has obvious damage on top of the cap was a silicone grommet. Many pyrex tank manufacturers use those, usually in place of a common endcap. The High Desert pyrex tanks use them (see below pics).
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My OCD tanks don't have silicone grommets, just the acrylic caps with typical black o-rings. So going by that, I've just realized it's the actual acrylic that was being melted by your cinnamon juice. My excuses if it was obvious to others.
That's some
strong juice you've got there to actually melt acrylic! What is the name and vendor that makes it?
Ocelot, I think your only recourse is to purchase the metal endcaps from OCD, since you still have a perfectly fine tube. I would contact him and refer him to this thread, as he does occassionally come here. Hopefully he might put a warning on his website that his acrylic caps may be susceptible to caustic juices.