Hi i have a male bearded dragon who is 13 inches, in a setup that is 4ftX2FTX2ft with a basking temp between 37-40 degrees cecluis and a uvb 10.0 reptisun. He would eat a mixture of calci worms and crickets rounding up to about 50 a day and sometimes roaches. He would eat mustard greens and collard greens around twice a day, apples occasionally and be misted 3 times a day with a bath everyone 1 or 2 days. However for a while now he has had really runny poo, as the solid is not well formed and usually with a large water puddle around his poo. There is always a white urate present however. I have got him wormed once and have used probation paste on him which seemed to work sometimes as his poo would return to normal however its continuing again. Im wondering if it could be parasites or maybe too much hydration or a problem with his environment?
My dragons poo is runny when she has extra moisture. Usually when I feed hornworms or offer fruit. The puddle around the poop is not a bad thing, it just indicates they had more water in them needed. Sounds like you do a very good job at keeping him well hydrated so my guess would be it's due to extra mouisture. Runny poo can indicate parasites but if you've had him checked recently and he seems to have a healthy appetite I wouldn't worry too much just yet.
Can you provide us with a picture of his poop? I know that's gross but we may be able to help you determine if it looks normal or not