Northern Lights - Double bubble

Week 13 complete and another travesty occurred. This is a lot harder than I thought. But I have been making major changes and the lesson is that when I do make the changes to be a little more careful in watching how things are going rather than leave it a day. It's especially annoying as I think Wanda has finally started to bloom :/ The recent changes I have made have been to add a new TS1000 Marshydro and a larger oscillating fan. I got rid of my 40W LED and now using the old 600W non brand for veg and put the TS1000 over Wanda and Wilma. In the last 24 hours (one day and one night) I registered a RH low of 30% and a temp High of 30C and RH high of 50% and low temp of 14C. So there are drastic changes over the night in temp. I may need to time the heating to go off when the lights are on to balance the temps and maybe put the fan on a timer too. However the reason for the fan was because I had a mites issue. To resolve this (and please feel free to interject in the comments) I wanted to increase airflow, hence the new fan, I have sprinkled Diatomaceous earth around the base of the plants, and sprayed some NeemOil on the base and leaves too. I know Neem oil is not recommended for flowering plants, so have only used it on Wanda and the others that haven't flowered in the tent. When I checked today they look to have gone mostly from Wanda and Wilma but there are some still on the other plants so will keep spraying and sprinkling to hopefully get rid. As you can see in the photos the plants have drained considerably. I have sprayed some water on the leaves and buds and given a good drink. They are in the lords hands now. Hopefully they will recover and we can continue onwards and upwards!