beardies wont shed....

Question
i have four young bearded dragons that i have had for about 2 months now. i have a 1000 gallon tank that holds them so they have plenty of room to rome. but im having come concerns with their shedding. non of them seem to be shedding. they have stayed at the same length in which i bought them at, which is about 6-7 inches long. now i know they usually grow a lot while they are young, but mine havent been. im just wondering why they havent been and if there is something i can do to help them grow better. i do use calcium dust and vitamin that i put in there water they get a numerous servings of crickets every day that are dusted. they are fed meal worms for treats and they get a new assortment of vegetable every 4 hours. they eat and drink water regularily. so im wondering if you could help me! thank you!!!
Thanks,
Joey

Answer
 You didn't say how old they actually were, or where you bought them. So I will guess that you have three month olds, and that you got them at a petstore.
 A 1000 gal. tank sounds huge.  But dimensions can vary.  Beardies like floorspace, so better long than high.  They need a basking temp of 100-105F and a cool end that's 70ish.  They also need enough basking area for all of them.
UVB is important for digestion and growth.  Not all UVB lights sold is good.  Top fluorescent UVB light is Zoo Med's Reptisun 10.0, and you will need enough to go from one end of the tank to the other. All the basking spots should be within 6-8" of that tube.  The bright white light that also can provide heat can be regular household bulbs. No night light is wanted.  Babies need their sleep, and need dark, the red light is disruptive.  In winter, get a ceramic heat emitter with a rheostat if your house gets cold at night.  Also stick-on thermometers can be off either way by as much as 20F, so a $10 digital from the patio section of Walmart, Acurite with a probe, will work better.  Attach the probe to the basking spot, and the unit on the cool side.  The "outdoor" reading would be the basking temp.
 I am hoping that you don't have tons of sand or any other particulate substrate on the floor of the tank...not good for babies.  Take it out if you do, and replace it with either reptile carpet, washable Duck brand shelfliner, newspaper, butcher paper, or paper towel.  Washed, sifted, children's playsand is okay when they are over 10" long.  If you have any kind of reptile sand or bark, use it in your garden, it is not good at all and leads to either impaction or disease from molds.
 Ok, food...you say veggies...that's good, but do you include good calcium rich greens? Collards, Mustard greens, turnip greens, dandelion, mache, arugula.  Do you include grated or pureed winter squash like butternut, kabocha or acorn?  Green beans, weet potato and snap beans are also good.  Stay away from acid foods like citrus or tomatoes. Carrots should be considered as rare treat as they are high in sugar and oxalates. moisten the salad by spraying water on it.  
 Most beardies don't naturally drink from standing water, they may while sitting in a water bowl, and will usually poop in it.  Misting them and the walls of the tank will make them lap at the water.  All water bowls should be taken out at night.
 Crickets, no bigger than the space between their eyes are best at their age.  No mealworms, they are hard to digest with a hard chitinous shell, and not as nutritious.  For treats, butterworms, silkworms, and phoenix worms sre high in digestable calcium and easy to digest.
 Only one cricket meal should be dusted, three times a week with Rep-cal or Miner-all Calcium and twice a week with Herptivite.  Through testing by vets and experienced breeders, those supplements are the only decent brands on the market.
 If you haven't had them to a good reptile veterinarian yet, it's high time.  Chances are pet store beardies have parasite issues and that may contribute to their not growing.  Also the vet will let you know if they are male or female.  In a few months you will need to know.  If you have males, you'll have to separate them as they are territorial and will attack each other when they hit puberty at 5-6 months. A 1000 gal. tank could be split with a sheet of plexiglas hot glued.  But they all should separate if they were bought together.  Chances are you have siblings and mating wouldn't be a good idea either.
 It is a rare chance that you also may have a breed of beardie called a Lawson's or Rankin's dragon.  They are similar to the usual beardie, but smaller with different markings and spike patterns.  It's a very remote chance but not impossible.