Not looking good for one of the chicks :(

The bluebelle chick I had last Fridays isnt looking very well today. She's all fluffed up and standing about, peeping her head off and her eyes look sad. The speckledy I got at the same time is doing brilliantly, scratching about, bright and alert, but I dont think the blubelle is going to make it. I've seen her drink and half heartedly peck at the growers pellets. Any idea of what could be wrong and what I should do next...I'm new to all this chick (pullet) keeping.

Do you know if they had been on growers long?

Many chick crombs have a coccidiostat incorporated, however it does "what it says on the tin" it stops the cocci from proliferating but it doesn't prevent the initial infection.

When the chicks come off crumbs and go onto growers (which isn't medicated) if the chicks have caught coccidiosis while on medicated crumbs, they can get a sudden illness when they switch to growers as the cocci are suddenly able to grow again.

Check for dark or overtly blooming poo.  If you can get hold of any coxoid it may be worth dosing their water for a week.

Fortunately they have passed the danger age for coccidiosis releated deaths (coccidiosis can kill in hours in very young chicks), but I would still be concerned.