I hope that you heed our warning and take this extremely seriously, I and SilverSage both are very experienced baby bird breeders/hand-raisers, and we both saw the photos you posted of your baby, and he is far too young to not be inside a Brooder...While I thank you for taking him in and I'm so sorry your friend died, what an awful situation to be in, and this is in no-way your fault at all as you had no plans to take in a baby bird, you must be extremely accurate with both the ambient temperature and the temperature of the formula...
You have to understand that in the wild, even in these parrot's native countries which are tropical and thus have tropical temperatures, the babies at this age are not only kept warm by their parents laying on them, but they also usually have at least one sibling to huddle with, and all of this combines to keep them extremely warm, far warmer than 80 degrees F. Simply based on the photos you posted of your baby, he needs to be kept at 95 degrees right now, for the next week or two, then decrease the ambient temperature back to around 85 degrees, and keep his ambient temperature there until he is ready to move into his "Weaning-Cage"...
Also, you want to make sure to keep at least the back-half of the "Brooder" covered, as baby parrots this age need to be in darkness, it's extremely important to both their physical and psychological health, as you are trying to replicate their normal "nest" environment...
Also, you want to read-up on "Abundance-Weaning", if you haven't already, I suggest that you do a Google Search for "Abundance Weaning a Congo African Grey Parrot" and study-up on the age at which you need to start putting millet-sprays in his Brooder, the age/number of hand-feedings of formula he should be getting at each week, and at what age it's suggested that you move them from the Brooder to his "Weaning Cage", and how to set-up a proper Weaning-Cage for an African Grey, for example, what types of different sizes and materials of perches you need, what types of food and water dishes/bowls/bottles you should have, what different toys, different mineral blocks, and what different foods you need to put in his Weaning-Cage, and how to properly set it up for him...****You do not at all want to simply not do the research on Abundance-Weaning and then end-up just "Force-Weaning" him without even knowing you're doing it, as this often happens accidentally, and it is extremely detrimental to the outcome of the parrot's personality, disposition, and overall behavior and psychological health...
The last thing you want at any point is any type of Gastrointestinal infection, Slow-Crop, Crop-Stasis, etc. So that's why we were so quick to jump on you about the ambient and the formula temperatures, as both can result in quick and certain death if they are off even by a degree or two, especially the ambient temperature the baby is kept in, as this directly influences the formula to just sit in their crops and spoil, causing both bacterial and fungal infections that kill quickly.
If at any point you notice any lethargy, disorientation, sudden loss of balance, keeping his head down on the ground in front of his body, runny or abnormal droppings, and most of all ANY VOMITING AT ALL, then you must get him to a Certified Avian Vet immediately for a crop flush, cultures including fecal swabs, and the proper Antibiotic, Antifungal, or both, based on the results of the cultures from the crop flush and fecal swabs...
It's also a very good idea to find a Certified Avian Vet now, if you haven't already, and take the baby in for a Wellness-Exam, if not now then soon. Luckily you're in Los Angeles, so you should have access to some extremely competent Certified Avian Vets.
And please come back and ask ANY questions that you have at any time. It's always better to just ask if you think something isn't quite right than to just assume it's nothing or that you're being "paranoid", as there are a million things that can go wrong while hand-feeding and raising a baby parrot, and time is always of the essence...
