If you get mites you will see the webs before they begin to take over the plant. They look like little red dots on the bottom of the leaf. The burnt tips and curling is do to a high ion content of the mix. (to many ferts) The spots follow the channels which is odd. Do you folair?

One love.....één liefde...un amour....eine Liebe....μια αγάπη...un amore...un amor
c