I've had this Red Japanese Maple for 15 months. I repotted it on February 28, 2009 and it was doing great ever since until I looked at it this morning and several of the leaves (two shown in middle of second pic top and bottom) look like the ends are drying up or look like their 'burnt'. Would any one know why? I repotted it in Miracle Grow Moisture Control Potting Mix 75% and 25% Cactus soil and water it every three or four days as needed. It's been doing great with many large new leaves coming out (see first pic taken June 22), until now. The leaves are wet in the second pic because I had just misted it with water. I also noticed many very tiny flies/gnats (?) hanging around the tree, about the size of the head of a pin. Any advise would be greatly appreciated.