its the miracle grow soil its to hot for sweet mary jane. wish i knew more how to fix the problem, one of the pros will have a few pointers for you. but next run dont buy miracle grow its no good
what else can you tell us about the set up like temps, humidity and lights will help. dont worry man i think any plant can be fixed but its something to learn from and do much better next time. every grower has their woes at some point. I just had a 15% germ rate from 12 seeds hah getting it to here is a feat in itself.:smokebuds:
youll want to try and get the temp down to 80 or under and try and pump up the humidity with a cup of water to evaporate. thatll fix the side curling of the leaves but someone else will have to help with the yellowing tips. make sure ph is in check around 6.2-6.8, you might try lowering your ph to around 5.5 to combat the hot soil, but im not 100% on that one.