Can someone identify what's wrong with my leaf?

[NRC707]

Room temperature sometimes reach 90+ degrees with Co2 burning. I'm not sure if that's the cause for the leafs to die out.

 

[Bloodguy]

Any creepy crawlies around?

 

[akuser47]

Id look under fresh new leafs use a high magnification you will probably find something living under leaves check them all. I know I just did, and I'm working on killing mine. I am unsure what yours are. If you get a good look then search pests on weed and you'll see images to help you match it. Then you can find a organic solution to rid yourself of them.