My shrimp doesn't move or graze.

One of my shrimps isn't moving around, just sitting on a pebble or a plant. Its antennae are not moving much either(I guess this can't be a good sign. If he just wanted to rest, then antennae should be active, right?). It does move in every couple of hours, then it sits there for the next few hours. The other shrimps look fine.

I think I should mention that I found a molt yesterday, though I have no idea that it was the inactive shrimp or another shrimp that had molted. Does this behavior have something to do with molting? I doubt that because it doesn't seem to try to hide, sitting on open sites (while I have only shrimps and snails, so there are no real threats). Or it was another shrimp's molt and this one is kind of preparing molting?

While the water conditions look fine for me.

Temp: 24 C
pH: 7.4
Ammonia/Nitrite: 0
Nitrate: less than 10 ppm
KH: about 7
GH: about 7

What do you think?

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The shrimp sitting on a plant

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