Help!

[Jjbretto]

Hi just wondering if any one can help me out , I’ve noticed one of my babies has a yellow spots on there leaves I’ve added some pix I’m only giving them ph water at the moment no food thanks jo

 

[Old Salt]

The leaf in the last image looks like something gnawed on it.
Do you water the plants from above, or mist them heavily? The spots look like water spots.