Another set up in a window.

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I just saw the rest of this thread. Your Tillandsias look great!

I've seen a lot of them in the wild. They need a lot of sun to bloom and grow properly. They also get dew almost every night. Most have C4 metabolism and open their pores at night, meaning it is better to get them wet after dark. Their metabolism also means they don't do well when nights are over 80-85 F / 26-30 C.

Mark Dimmitt, former curator at the Arizona Sonora Desert Museum, recommends people growing them indoors spray them wet with water every evening, if possible. He also says to soak them in a sink overnight once a week.

I'm going to guess most people who struggle with them don't water enough and don't give enough light. I've seen them sold as terrarium plants for arrow dart frogs, but I don't think most of those terrariums have enough light.

Oh... and most bromeliads are intolerant of copper. Don't use copper-containing fertilizer with these plants. Don't use water collected from bronze fixtures. Pineapples tolerate copper in fertilizer.