I've run out of the hinterland trading air plant fertilizer (2oz). I was going to buy another, but it's bothering me that I can't find any information on what is actually in it, only the NPK 17-8-22. From what I understand they absolutely hate certain minerals/nutrients like copper, zinc, and boron. I can't say if this fertilizer has done anything because I don't have experience without it to compare it to.

If no one knows what is in it, or if it is good/bad, what other fertilizers are out there for tillandsia?

I absolutely love tillandsia. I'm building up a small collection, started with 3 different species last February and is now 8 different kinds. Trying to make sure I'm doing everything right, so far I've only lost one, the argentea came in bad shape but was so cheap thought I might try to save it.