HELP???

[Veralyyy]

Alright so I had my bearded for about 6 months already he been doing great until 2 weeks ago I noticed that he’s poop has been a little bit runny it wasn’t so bad until now, he also starting to open he’s mouth alot I don’t know if he is trying to regulate he’s body temperature or something worse he’s tail also turned a little bit blacker. He is in a 40 gallon tank. UVB is like a few days old (just replaced it) and also he’s tank on the hot side is about 98ish and cool side is about 80. He eats greens everyday staple is mustard greens and also he eats butternut squash and also a lot more kind of squash. He eats crickets mostly like 40ish all he can eat within 15 mins. So should I be worried or ?

 

[CooperDragon]

His appetite is good which is encouraging. Is he active and alert? Has anything changed in his diet recently that may have given him an upset stomach? Squash is pretty high in water content so if he's eating a lot of that it could have his poop runny. Can you post some photos of him and his enclosure?