Plant Problem Please help

I have three trainwreck plants all in there 5th week of flower and i plan on harvesting 20 more days(almost 3 weeks). My plants started to get white spots on the water leaves and then there started to become brown spots on them as well. The brown spots looks almost like burns. Today i find them with many drooping water leaves. Is this normal for the end phase or is it too early for that? I raised my light and increased ventilation for hopes it my be heat burn that caused drooping leaves. I also stopped feeding them any nuts and switched to filtered water. The buds on the plants look un harmed and great but i hope to stop my problems before it gets any worse. Thanks for any info you all have!
 

Attachments

Top