They're very sweet and adorable...The only comment/advice I can give you based on the photos is in-regards to the container you have the Alex in...#1 If he still does not yet have all of his outer-feathers grown-in and still has bare-spots and down-feathers showing, then he needs to have a heat-source that is keeping the ambient/air temperature between 80-85 degrees F at all times, because they cannot regulate their body-temperatures until ALL of their outer, mature feathers have grown-in, and the most-common issue that happens very, very often is they develop a Fungal (Yeast) infection throughout their Gastrointestinal Tracts, usually starting in their Crops and that spreads throughout their GI Tracts all the way throughout their Intestines; If the ambient/air temperature they are being kept in is not between 90-95 degrees F before all of their Down-Feathers grow-in, and not between 80-85 degrees F before all of their mature, outer Feathers grow-in, it's just as deadly to them as feeding them hand-feeding formula that isn't ALWAYS between 104 degrees F and 110 degrees F at all times until they are fully-weaned and no longer eating any formula at all. The same Fungal/Yeast infection will form throughout their entire GI Tracts in both situations, so you must always keep a candy/cooking thermometer in their formula at all times while you're feeding them formula to keep it no lower than 104 degrees F and no higher than 110 degrees F, and you must always keep the ambient/air temperature they are living in between 80-85 degrees F until every bit of their outer, mature Feathers grow-in...Usually people achieve this by either buying a proper Brooder and keeping them inside of it until all their outer feathers grow-in fully, OR they put an electric heating-pad with an adjustable-temperature setting underneath the box/container they are being kept in, and then covering the top of it with a towel, and hanging a regular thermometer inside the container/on the container to make sure it's always reading between 80-85 degrees F...
The #2 issue is the bedding you have in the bottom of the container he's in...I'm not sure what it is, but it looks like some type of bark or mulch, or some type of wood-shavings, and this is not good at all. Baby birds eat EVERYTHING, or rather they put everything inside of their beaks, and this is why it's very common for young, baby birds to suddenly develop an impacted or obstructed Crop or Intestinal Tract. He cannot digest any type of wood or bark chips, they will simply go through him whole, if you're lucky enough for them to make it all the way through him. Usually that's not the case, and the wood-chips/mulch, or God-forbid that's something like Crushed Walnut-Shell bedding (it just occured to me that it actually looks like Crushed Walnut-Shell bedding as well), or any type of "Corn-Cob" bedding, because not only does all of this stuff cause GI obstructions and blockages and often requires surgery to remove it and save the baby bird's life, but the Crushed Walnut-Shell and the Corn-Cob bedding regularly also causes severe internal-bleeding and then internal-infection in the wounds, because both the Corn-Cob bedding and especially the Crushed Walnut-Shell bedding have extremely razor-sharp edges that cause cuts all the way from inside of their Crops, down their Esophagus, inside of their Stomach-lining, and then all the way throughout their Intestines. And this is extremely common in both baby birds and in all reptiles that are kept on that stuff...It should be taken off the market, as it's just not safe for any animal to live on.
I would highly suggest that if your Alex is still living in a container and hasn't yet moved into his Weaning-Cage/Starter-Cage, that you dump out whatever that bedding is and replace it with a shredded-paper type of bedding, such as Carefresh or something similar. There are lots of different brands of shredded-paper pet bedding, and any of them are great to keep in the bottom of the Brooders/containers that baby birds are being kept in. It's safe, it's much more sanitary, it keeps them from developing Splayed-Legs, and most-importantly IF THEY EAT THE SHREDDED-PAPER BEDDING THEY WILL DIGEST IT!