About two weeks ago one of my two bamboo shrimp changed from from mostly brown to red and it seemed to stop eating(it wasn't fanning anyway). That lasted about two days then it started fanning again and it went back to being mostly brown with just a light red tint. The other one doesn't show any red. This week the one turned more red again for a couple of days. Now it is only has a light tint of red again. It didn't stop fanning this last time. Does anybody know if this is a sign of wanting to mate or something else?