lilo is what its called in the uk, its like kitchen and bathroom flooring and most of the time looks like tiles(very easy to clean and it just wipes off) and tiles are just that.. like garden tiles that you canbuy from a DIY store. you can also use repri-carpet some people use newspaper for younger beardies.
for the baby food i use chicken and butternut squash. you can use any that beardies as eat. look at this web site if your not sure
http://www.beautifuldragons.com/Nutrition.html
what do you mean by there is a screen between the uvb and the tank? if there is anything between your beardie and the uvb can you change it so that there is nothing and uvb can not pass though glass or plastic.
i weight mine on kitchen scales, just make sure you clean them off after.
one last thing about uvb, tubes stop producing the corect levels of uvb after about 6 months even though they say a year or longer ask anyone on here they should be changed after 6 months as a rule.
your set up looks ok to me just not sure about the uvb but we can find out and the sand is your choice but 95% of people will tell you to change it. in the wild they are'nt on sand either.
its good hes looking better, hope he gets better soon