Hi there, im growing acacia simplex indoors. It looked fine till recent when some seedlings started to lose leaves and die without apparent reason. They are all in a rich soil, have enough light and watered regularly. Could anyone please give an insight on whats wrong is happening with them? Attached is a picture of a largest seedling losing the leaves.

To follow up on this issue, it appeared that I was overwatering the seedlings and unfortunately many of them died. If you are a fellow aspiring grower, never water them every day like I did, only a couple of times per week at most, or when the ground gets visibly dry.