Yes too much of that will cause impaction you dont want that---- please use paper towels for now then you can get some textured NON adhesive shelf liner from Walmart or your local home improvement store - insects cannot get underneath cut it to the size of your tank clean w/ vinegar/water 50/50 then wipe down w/ a clean wet towel / dish rag -- please go over your UVB your using and your basking bulb --- details please --- where in the tank is the UVBMy dragon has been licking/tasting his substrate and there is gravel in his poo. It's jurassic natural australian substrate which was listed by reptifiles as a safe loose substrate but now i'm worried. should i remove the substrate?
Please change the 5.0 out for a 10.0 bulb -- the 5.0 is more for aquariums and the 10.0 is for reptiles - I am guessing shes eating the substrate for calcium D3 --- you dont want her eating that -- your UVB is going to help her absorb / synthesize the calcium shes eating -- please make sure the 10.0 bulb is directly above the basking decor piece 12-15 inches -- 5.0 bulbs should be 6-8 directly above the basking decor --75W CHE, 39w 34" Zoo Med Reptisun 5.0 T5 HO UVB Fluorescent, 150W Fluker basking bulb.
The bulbs and CHE are setup according to this guide: Bearded Dragon Lighting: The Complete How-To Guide - Reptile Advisor
The UVB is inside the tank.