Do these guys usually molt at the same table me?

[MaddiesMom]

I have four crabs, small to medium/large. All have buried themselves and not been out (water and food dishes undisturbed, no movement of fixtures, etc) for several days. Temperature is about 76. Don't have a meter for humidity, but it is almost summer time in Atlanta, GA -- I don't think humidity would be a problem. All were pretty active until then. I have also noticed what look like dime to penny sized clumps of substrate that seem almost glued together.

[Wai]

They aren't necessarily moulting at the same time, but it does happen from time to time.

[aussieJJDude]

I'd suggest getting a humidity gauge, crabs do dig under if conditions above aren't ideal, such as humidity or heat too low.

In smaller tanks/smaller number of crabs, moulting cycles can and will tend to line up with one another. Its pretty common if you have a small amount of crabs, especially if the same size.

[ladybug15057]

All hermies molt at different rates. Some every few months, some once a year or so. We have a Jumbo who use to molt a couple times a year when he was smaller. When she technically became jumbo size for a year she molted every 3 months! Her molting now has slowed down.
I would strongly suggest getting a humidity gauge and calibrating it. Hermies do need humidity to breath properly through their modified gills. We are in a heat wave right now where the dew point is high, but if any air conditioning is on it is very important to monitor the level in the tank.