Why is my red claw crab so lethargic?

Question

I'm worried. I got a red clawed crab 2 weeks ago. He has spent this time in my betta tank and he was OK. I would find him in different places every time I would look for him, I have seen him eating a couple of times too. Then I set up his brackishwater environment and transfered him in. The water temp is at a steady 78*F [25*C], gravity is right at 1.007. I transfered him in 2 days ago and he's been sitting in almost the same spot this entire time. I dropped a sinking food pellet right next to him and he doesn't display much interest. I thought he was going to be happy with his new home. I poked him, he's still alive and kicking.
Any idea why this is going on? I don't have a kit yet to test the water, but it should be OK. As I said, 2 days old, I have a Tetra Whisper pump with activated carbon filter, water is nice and clear.
Any advice and links to red clawed crab behavior would be more than welcome.
Also, do fiddler crabs live in the same environment? Could I get 2 females maybe?

Answer 1

Did you cycle the new tank before introducing the crab? Poor water quality is worse for inverts than it is for fish.

Also he may be moliting. Crabs will be very inactive for a while before molting, then will return to normal.

I wouldn't put in any fiddler crabs, they will probably fight.

Answer 2

now and again animals only die, maybee there grow to be mild difficulty witht he water situations or no longer sufficient oxygen, maybee with out the airfilter oxygenating the water it grew to grow to be poluted, im no longer to certain, ive in trouble-free words only began holding goldfish, one in all them died over evening and that i could not comprehend why, healthful in the destiny, lengthy previous the subsequent. now and again those products only take position. good success with the subsequent one

Answer 3

well u needed to test the water before hand