Maybe they need a bit more light. New growth was glossy on mine too.

Okay, I'll try that. Thank you!

Noah,

It looks like it's getting plenty of light (or recently has gotten same) - the reddish tone indicates this. IMO, the soil needs to be changed to something more porous and the plants appear rootbound (perhaps because they're not absorbing water as much, hence adding to the reddish tones).

Sounds good, do you think standard sand/soil cactus mix would work or should I mix in some pumice too? Thanks for the advice!

Cactusharris, think the red may be drought related, not sun related. Mine is near crimson, but still thin. And second, the poster can use sand, as long as its not pure limestone, and is coarse enough.

Because pumice is not that easy to come by.

I agree with Stefan. It is showing etoliation from lack of sufficient light.

It's currently sitting near an east facing window so it gets some direct sunlight in the morning. Should I move it to a south facing window or is it okay where it is. It also got less light during the winter, so maybe that's part of it?

I guess in your part of the world a south facing window gives the most light. It needs more light than it is currently getting.

Yep, northern hemisphere here. I'll try to find a place where it will get more light.