All chickens doing white runny poop and behaving oddly

[le chicks1]

I have with me one pekin rooster, 2 lavender brahma bantams roosters and 2 lavender brahma bantam hens, all 10 weeks old now.

I've had them for nearly over 2 months now, they've always lived together and because I'm mostly away from home they're usually scared of me and never come to me for treats or anything.

Since tuesday they've been just sitting in a corner, all huddled up together and they barely move out of that corner.
I thought they might be cold so I upped the heating slightly but they just don't seem to move from that one corner.

I have never been able to catch Buddha (pekin rooster) but just now when I went to check up on them he just stood there as I stroked his head. They don't seem to be eating as much as they did 2-3 days ago and now alarm bells are ringing in my head.

The alpha rooster of the pack who jumps up to fight whenever his hens are touched by us didn't bother move from the corner when I picked up a hen to wipe her tail. The chickens don't seem as nimble as they used to be, they've just sort of given up running away from us 'predators' and just seem to sit in one corner all day and night and they rarely crow nowadays too.

Could someone please suggest what might be wrong with my chickens?

I'm looking for a vet specializing in birds but there's no one close to where I live.

I just am so worried about the chickens and I don't know where else to turn but BYC

Any helpful feedback is much appreciated.

 

[GrandmaChickie]

What kind of set-up are they in? Inside? Outside? With most of the nation in a heatwave, I thought it odd that you would think they are cold, so are they in the A/C?

 

[dawg53]

What are their ages? What are you feeding them and do they have freshwater available?

 

[le chicks1]

Well our backyard is still not ready and secure for us to keep them outside so they live in a spare room in the house.
We live in the UK and it's slightly cold in the house, I usually keep the heat up to a minimum for 22 degrees celsius for us and them.
I just sat with them watching them, I have them pellets and they have barely touched them and I've also given them room temp water and slightly cold water separately so they can drink to their needs and they're drinking water a bit but food they didn't touch.

Also they all just pooped in front of me and all 5 of them have white watery poop with bits of normal poop within it.

 

[le chicks1]

What are their ages? What are you feeding them and do they have freshwater available?

They're 2 months and 2 weeks old and I gradually got them off chick starter onto layer pellets but they haven't eaten many pellets thus far.
Fresh water is always available, I change their drinker 3 times a day.