Bull Not eating

I have a bull about a year old and about 20" or so that has been eating fine up until a month ago. Now it won't eat...any guidence ? He's still very active and no problems with holding him...but just won't eat....

Give us a Little info on how you have it set up, and what you have been feeding it so far.

I have him set up in a 25 Gal. Aquarium with reptile bedding...(kind of like wood chips)...he has a tree to climb and a large water dish. There is a reptile lite on top and the cage stays at around 70. The standard diet that he's been getting was pinkies at first and now has moved up to fuzzies. He's been doing great until about 4 weeks ago...nothing has changed...so I'm a bit confused as to why he's not eating.

What are the temps ?

In the cage...about 70 to 75 during the day and the light is out at night so around 68 to 72 at night.

I would raise the temps, you should provide a temperature gradient (cool side and a hot side). The cool side should be about 72-75 and the warm side about 80-83.
Adjust the temps and try feeding again.

If he were older I would think he's more interested in breeding instead of eating.