Photo?

You need to let it bloom to identify it corecctly. They are not difficult plants to grow, but it needs a careful watering. If the temperature is very low, don't water it. I've them with a mixture of sand or pumice in some pots. Try to provide it a very drainging substrate, no overwater and it will be ok.

It would be much better for your succulent, for long term health, if it was planted in well-draining mix, container with drainage hole (plastic, terracotta) and planted higher than it is now.

Glass containers without drainage are not suitable for succulents (yes, they will grow for a while and even look good, but in the long run there is potential for over-watering and more problems). It doesn't take too long for them to decline. They don't like excess humidity either, and container like yours will get more humid too.

Thank you Rina, this photo is a week or so old and has since been planted in a much much larger pot with some other plants.