I never fertilize my tillandsia and they grow very prolifically, but I have all of them outdoors where they get plenty of air circulation. I think they get a lot from the air. All I do to mine is mist them, and most are hanging in my apple tree. Yours might be suffering from poor air circulation - that's my best guess.

How much light does it get?

It's not the RO. I've been using that for years to water my orchids and other plants.

Almost looks exterior, such as a chemical bleaching. Are these near a pool? Maybe chlorine?

What are you fertilizing with? Possibly burning the leaves.

Jane

thanks guys! At my old house they were watered with tap water, and a weak monthly bromeliad fertilizer. but now that I've moved I'm using the RO filtered water and no more fertilizer. So once all the areas that are splotchy yellow, turn brown this should stop happening? That's my main concern. I just wanted to make sure it was that and not some kind of disease or something. I didn't realize how sensitive they are to chlorine. Most of my plants (non-tillandsia) aren't picky enough for water straight from the tap to be harmful, but it seems these are. it's just weird it took so long to show up. If it was the fertilizer or the chlorine they should stop showing damage once it all works out of their systems? fwew!

Yes, the new growths should look healthy.

Jane