I just opened my cardinal red vaporfexion tank, filled it with my cherry blossom juice...Suddenly juice everywhere! I looked closer at the tank and it was full of little spiderweb cracks!...I have been using this juice in a smoketek tank for a month. I'm thinking the tank was damaged when I got it and I didn't notice it...What do you all think?
"Our tubes are our exclusive through and through color
Polycarbonate." -- that's likely your answer right there. The spiderweb cracks are a notorious sign of a chemical reaction between polycarbonate plastic and certain substances found in some juices. The typical juice flavors known to cause this are the cinnamons, citris, and acidic flavors.
You mentioned that you had safely used this juice in a SmokTech tank for a month. You didn't mention how long you've had this tank. Recently SmokTech began offering polypropylene tubes in place of the polycarbonate tubes in their tanks, probably because of what just happened to your Vaporfexion tank. Polypropylene is another type of plastic that medical syringes are made from, and is immune to caustic e-liquids. You often can tell the difference between the two types of plastic if you look closely -- polycarbonate is crystal clear while polypropylene is frosted or opaque.
Not all cinnamon or citris juices react with polycarbonate, but enough do that most people aware of this potential problem either avoid putting these juices in polycarbonate devices or put them in safer containers like polypropylene or pyrex glass.
There is a thread here that has a continuously updated list of juices confirmed to melt or crack polycarbonate.
http://www.e-cigarette-forum.com/forum/tanks/219179-lets-make-list-juices-flavors-crack-tanks-ce2s-clearos.html
Sorry about your misfortune. Those are very pretty tanks, but I avoided buying one because of the material the tubes are made from. The manufacturer does sell replacement tubes for a few bucks. All my tanks are either DCT polypropylene tubes or made from pyrex so I don't have to worry about what juice goes in them.