I am so afraid of fertilizer. A little too much and it spells death. 'They' say when the roots develop, start with a diluted mix. This is where the plantsmen differ from the hobbyist. My self, I would wait until at least 5 months old. And using 1/4 stated amount.
In nature, they grow along a hill side with little or no humus, just rock, sand, some clay. So I have been lead to understand. Having never done this before with Aloe's. All I can say is keep us informed so we can learn.
Stush