I can see purple/reddish stems, did you give it too much fertilizer?
Temperature? The water should be around 20 degrees Celsius. Are you growing in cold environments?
It could also be overwatering; does the pot have good drainage? Don’t let water accumulate in the drainage tray, the plant will keep consuming that water. You should clean the drainage tray if it has water and check if the water drains well.
Is the soil still moist after 3 days? If so, it’s overwatering.