After posting these pics I would definitely start them on Chorid and worm them also.
The first pics you posted, looked like poop from birds in a hot climate. That is the reason I said, " looks normal" after finding out your location and looking up the temperature in Portugal, it's not likely the problem ...but these pics, there is nothing normal about....partially digested food and the 'foamyness' would suggest Coccidiosis.
I also found a thread you had posted earlier, asking for help with your birds because you thought they had Coccidiosis. So now, I would treat for Coccidiosis and worm them, too, if you haven't already!
The first pics you posted, looked like poop from birds in a hot climate. That is the reason I said, " looks normal" after finding out your location and looking up the temperature in Portugal, it's not likely the problem ...but these pics, there is nothing normal about....partially digested food and the 'foamyness' would suggest Coccidiosis.
I also found a thread you had posted earlier, asking for help with your birds because you thought they had Coccidiosis. So now, I would treat for Coccidiosis and worm them, too, if you haven't already!