I agree with all the IDs above. Each succulent group has different care requirements. Not sure what soil you have them in but it doesn't look good. Looks like mulch?? If it is just on the top, remove it. If it is all through, replant them. If you keep these types too mosit they will rot.
Care:
Sedum-good draining soil with organics mixed in. Grows well in full sun. Likes it a little drier. Water a little less than others.
Haworthia- similar to aloe. WELL (not fast) draining soil with some organics mixed in. Water until water runs out the pot when dry. Wait until dry to water again. Best in filtered sunlight or part shade. Too much sun causes sunburn.
Echeveria- this one likes it a little more wet. Not soaking though. Good draining soil with organics. Full sun to part shade.
Soil: I prefer to make my own soil. None of these are attractive so a top dressing of gravel makes things look nice.
FAST draining soil: I grow split rocks and they require fast drianing soil with little to no organics. This means water just runs out. It is a mix of corse sand, fine sand, vermiculite, perilite and some potting soil.
WELL draining soil: Mix 2 parts sand to one part soil.
GOOD draining soil: equal parts soil and sand.
Also water the soil and not the plants. Watering the plants can cause rot.
Good luck!!
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