It will work! You have instructions on it for pigeons too.
I did not know you were in the UK.
Let me get Kathy in here. I think she knows UK options better
@casportpony
I would start with severe because of the symptoms. Make sure all of them are drinking water. if not, you can use the liquid as full strength by using a dropper, a drop several times a day until it starts drinking on its own.
If it is coccidiosis, they usually start recovering in a day. Do...
Symptoms are the puffed up, eyes closed and yes to watery poop! Bloody only happens with one of the strains of coccidiosis.
It will not hurt to treat them. Use corid. It is not a poison but a thiamine blocker so it is very gentle on the bird