I'm only sharing my experience. YMMV. When I used to make polycarbonate tanks any juice with ecto in it would cause the rubber stoppers to melt so bad the juice would taste like plastic and rubber. Thats when I went all-glass for my juices/flavors/ and (mostly)tanks.
I still have a couple of Polypropylene tanks I made with silicone grommets, they work great.
I still have a couple of Polypropylene tanks I made with silicone grommets, they work great.

Soo good. but a little on the pricy side. They are more concentrated though, it makes up for the price