Over watered and drowned, causing rotting (blac spots) and an inability to metabolize nutrients properly.
Water your plants then do not water them again until the top inch or so has dried out is the correct procedure.
At this stage, it looks like you will not have to water again for another 4-5 days at least.
Never water to a schedule, like every day at 7pm or whatever.
Only water once the top inch of the soil has dried out again after the previous watering.
You could also start with some half strength fertilizers when you do resume watering.
Also, start a diary, it seems you might have more questions in the future and the more info you have (a diary) the easier it will be to help solve any issues you may have down the track.