2 Amano Shrimp Hiding

I'm pretty new to shrimp, so I'm wondering if any of you experienced shrimp keepers have seen this before. 10 days ago I added four red cherry shrimp to my established 10 gallon planted tank. All four seem to be doing just fine and have been cruising around the tank. Four days after I got the Cherry shrimp, I got 2 Amanos. They were out and about the first couple days, but have consistently been hiding behind the very top of my heater since then (around 5 days now). A day after they started hiding, I saw an exoskeleton in the tank so then I thought maybe they molted and they were hiding while they recover. But it seems strange to me that they are both still hiding, 4 or 5 days after potentially molting (assuming that molt was even from one of them and not the cherries). I'd be tempted to think maybe there's something with my water that is not hospitable to amano's, but I added two more from a different store three days ago and they have both been cruising the tank and hard at work cleaning ever since. I'm wondering if the first two are just defective , or is it normal for them to hide that long after molting? Or any other explanations you can think of? The tank was well established and cycled, temp is 76, parameters are 0-0-10, pH is about 7.4. I don't have any aggressive fish. Thanks

 

Amanos are tougher than cherry shrimp. If the water is good enough for the cherries it's probably good enough for the Amanos.
It is normal for them to molt when introduced to a new tank.
I have about 20 Amanos and sometimes I don't see any of them for days and then I see all of them out swimming around at the same time...

 

Does anyone know how long they usually hide for after molting? the spot where they are hating wouldn't even provide any food, so it seems a little odd to me, but I've never had them before so who knows. Yeah I kind of figured if the cherries were doing well then the amanos would be just fine, so I was surprised that these two were so reclusive.

 

I added four amano shimp to my 55 gallon tank and did not see one of them for four months. I thought they all died. Then one day all of them came out of hiding and have been happily eating algae and fish food out in the open since then.
They are VERY good at hiding.

 

Thank you both. Guess I won't worry about it. I kinda feel like the LFS I got them from might have sketchy stock. Hopefully they'll snap out of it at some point. At least the other two I got are lively. One of them has made it his life's work to clean off the ornamental bridge in the tank. It hasn't looked this clean in years!

 

They must have known I was talking about them because one of them is now out and hard at work right next to the other two. One is still hiding but maybe he'll get lonely and join the others.