Hi...Just so I understand... Are all 3 dragons in the same enclosure? If so, you need to separate them. They are stressing each other.
How old are your dragons?
What size enclosure (s) are they in?
What kind of substrate is on the floor?
What brand and number is your UVB? Is it a coil, compact, long fluorescent tube, or MVB (Mercury Vapor Bulb)?
How close is the UVB to the dragons?
How old is your UVB?
How many watts is your basking/heat bulb? Is it colored?
What is the temp of their basking spot?
What is the temp of their cool side?
What do you use for a thermometer? stick on, temp gun, digital with a probe at the end of a wire?
Being specific, what do you feed & how often?
Do you gutload your live food?
What brand of calcium & of vitamins do you dust their food with?
How often do you dust their food?
You said you gave them a shower...do you also soak them in a
bath?
Have you taken any of your dragons for a fecal to see if they have parasites, coccidia, bacteria, etc.?
If you could answer these questions, maybe we can tell you how to tweek something to help your dragons.
Good luck
Patsy