Is this mould?

This is my third grow. Firs time I've had leaves do this. Been reading alot of the tutorials and it doesn't look exactly like anything I've found online. Can anyone tell me whats going on with this plant? I'd really appreciate it.

check under your leaves for bugs

^ ..mites, sorry bud, look it up and start treating it fast cuz it's fairly advanced

Spider mites, so check under the leaves with a a jewelers scope for the pests.If not consider purchasing an organic anti-fungicide or a homemade alternative, that is if there are no suitable brands available.
Hope this helps.

Thanks guys, started treating for mites and the plants exploded w growth and the mites are gone or on their way out. All new growth is again.