https://www2.ipm.ucanr.edu/agriculture/floriculture-and-ornamental-nurseries/Fusarium-Wilt/

That also seems to describe the state of my seedlings. 70% of the stem is still green, 30% already looking dark orange/brown and dry. Just as they describe it, it seems to be running from the roots up the stem until it kills the whole plant

I have no experience with almonds but I do know they grow in places with winters and cold nights. I think you should stop bringing them into warmth at night and grow them ’harder’. They also grow in places with low rainfall so it’s possible you are overwatering. Both warmth and moisture encourage fungal infections.

All their leaves already drooped a few days ago. Currently the virus, pathogen, fungus continues to go up the stem, but, yes...looks like they are already dead pretty much due to the blockage of water from the roots up the stem just like the research describes it. Wish I knew this before. I will be sterilizing this soil at hot temperatures from now on. This Fusarium fungus...ruined my work, and looks like you cannot treat it, but prevent it, once it enters a root, it just destroys the plant, and it did become more active in full sun when the soil went over 70° F, it was not as active at night judging by how the leaves tried to come back at night after drooping somewhat, but it was already actively killing the plants anyway.. I took out the seedlings, took pictures and all, made the homemade fungicide with a table spoon (not a big one, but 1 table spoon) of baking soda, one of veg oil, and tea spoon of soap, soaked the roots in this for 2 to 5 min, put the seedlings in coconut peat, but nothing worked. At least I learned something...the hard way.. It is surprising how you find any info about literally anything on the internet, but really not much about plants, and well...yes every plant is different, is susceptible to different pathogens, etc, it is too complex to expect to find all of this easily after 1 google search. Hope can succeed this time.

"It is surprising how you find any info about literally anything on the internet, but really not much about plants,"

I have never found this to be true. There is just as much info on plants online as there is on anything else. The issue is finding information that is reliable and accurate. And it will always provide far better results and much more info if you search by the correct botanical name and not the common name.

"the leaves tried to come back at night after drooping somewhat"

I think what you were actually seeing is that the plant was recovering slightly due to the reduced stress without heat and sun. Basically, the plant's systems were crippled, and during the day, crippled system was inadequate (thus the plant would droop), but at night it was sufficient for the plant to somewhat recover. I've had mechanically damaged plants react similarly ... they're damaged all the time, but the effects of the damage are more drastic depending on environment.

Almonds are very picky about their environment. In the United States they only grow in the deserts around Southern California where they are irrigated. Without irrigation they quickly die due to lack of water. No pest, fungal disease, or humidity.

Occasionally you will hear of someone having one somewhere else, but they never make a crop due to rain during the fruiting season or freezing since they also bloom really early in the spring, really in late winter. And this is in areas that get 30 inches or less of rain each year. In southern Cal they get rain only in the fall and winter and have no rain in the summer months. Almonds do not like rain or even humidity. And those that do grow probably have been grafted with a root stock that will tolerate soils that otherwise would be too wet.

Honestly, I think it would be nearly impossible to grow almonds in your climate. You said you got the seed from Israel, another area that is arid with little to no rainfall in the summer months. That is probably the only type of place that they will actually produce any fruit.