Happy new year back at you.

If you have a mite problem you can use Provent-A-Mite, it is the only product that has undergone 14 years of research and that is safe to use with reptiles.
PAM will eradicate all stages of development of mites for good, it can be purchased here http://www.entirelypets.com/proventamite.html

Here are some info on snake's health issues http://www.vin.com/VINDBPub/SearchPB...00/PR00338.htm
I have no clue what IBD is or what to look for.
IBD is believed to be retrovirus; here are some information on the subject http://www.pkreptiles.com/informatio...ticles/ibd.asp
What would be best to clean the tank out with?
Different people use different products, I mainly use Chlorhexidine http://www.agri-med.com/site/255063/product/CHLRHX2SOL for spot cleaning and weekly cleaning, than once a month I use a 5% to 10 % Bleach solution.