Hello John,
Sorry to hear your beardies are not doing too good. As Sheena mentioned the lettuce can cause a runnier stool, but I would be more concerned with parasites. You should really have a fecal done on both of them...to rule out parasites. Sheena gave you a link to a great list of foods for your beardies. Dark leafy greens such as collard or mustard greens are a much more nutritional staple for your guys, along with a variety of other veggies. The dandelions are great...just make sure they have not come in contact with any pesticides, which could make your beardies very ill.
As for the superworm's....they are actually a great staple for adult beardies(sorry Sheena) but those are generally not recommended for beardies under 16" in length.
The Reptiglo 10 as mentioned is not a great bulb! Please consider getting a different source of uvb, such as the ReptiSUN 10 fluorescent tube or MVB(mercury vapor bulb), which is uvb and heat in one bulb. The mvb's must be used in a minimum of a 40 gallon breeder tank, due to the amount of uvb and heat they emit.
I am a little concerned with the size of your dragons. You mentioned they are both adults, one being 9 yrs old. At 8" and 12" they are very small for adults. What is the age of the 12" dragon? Are they Rankin's or Lawson's dragons by any chance? Do you have pics that you could post of them?
I am going to ask you some questions.
How old are both of your beardies?
How long have you had your beardies?
Have you been using the ReptiGlo 10 on them their entire lives? If not, what uvb did they have prior to the ReptiGlo 10?
How close can they get to their UVB?
Are you using a bright white basking bulb?
How close can they get to their basking bulb?
What are their basking and coolside temps?
What are you measuring the temps with? digital thermometer with a wire and probe end, stick on, temp gun?
What are you feeding and how often?
Are you supplementing with Calcium and Multivitamins? How often?
Do you
bathe them for
hydration? How often?
When was their last fecals?
If you could answer these questions....we can try to help you out with getting your beardies back on track to a healthier lifestyle.
Dawn