F10SC or F10SCXD

I am going to buy some F10 and was curious as to what anyone uses. I have read the info and seems to me I should get F10sc. Does anyone use F10 and if so what do you use and how. I am just confused which to buy and use.

Thanks in Advance...
Alan

The F10SC is the product that you want if you can find it. Many places have been out of stock for quite some time now.

For your reading pleasure: http://www.reptilebasics.com/f10sc-faq