On January 6, the fire broke out at about 4:30 am on Kings Canyon Road near Clovis Avenue.
Video shows two suspects breaking into the "Blenz Barber Lounge."
RELATED: 2 suspects wanted for starting fire that destroyed several Southeast Fresno businesses
On Wednesday, Fresno Fire and Valley Crimestoppers increased the reward to $5,000.
Investigators believe it was a targeted attack.
Six businesses were damaged or destroyed, and nearly 50 people were left without a job.
RELATED: Five Southeast Fresno businesses destroyed in 3-alarm fire
Anyone with information about the suspects is asked to contact Valley Crimestoppers at 498-STOP. You can stay anonymous.