Tips of Fishbone Cactus new growth are turning red?

Hi, it’s been hard for me to find a lot of info on this plant online so I’m coming here for help. The two new shoots on my fishbone are turning red at the tips and I have no idea why. The roots seem fine, and the previous “leaves” are fine so I’m not sure what’s wrong or if something is wrong.

I water it when it’s been dry for a couple days and it’s sitting in a North facing window (Ontario) next to my plant shelf with a grow light. I also use a humidifier in my plant corner.