Anubias are super simple. Like PP have mentioned, don't bury them in the substrate. I like to just wedge them between rocks, or use little twisty ties to attach to driftwood (I do this with java fern too, as the same principles apply), or I've read you can use gel superglue to attach to stuff too. Yeah, they don't need much - just chuck it in and let it be.
I bought most of my plants from buceplant.com No problem with snails and everything came in super healthy. Huge selection and really reasonably priced as well.