Avocado plant question
A coworker and I decided to plant two avocado pits as an experiment to see how they would go. We first did the whole toothpick in the pit, suspended in a glass of water thing. This worked pretty well, and after a few months we moved to soil. Here we are about 8 months since we started this project and we have two plants, roughly 12" each. Recently, we moved to a new office space with great sunlight, however the soil is drying out much more quickly and the plants are looking a bit sickly.
Can anyone tell from the yellowing/brown marks on the leaves what the issue might be/what nutrients we should add? Could this be an issue where the plants are getting too big for the pots? Any general tips? Thanks!