I'm new to all of this, so I look forward to your answers. So far, I've used the Purifiber and Aquaperl. I heard that you need to watch DE because it can hurt you if you accidently breathe it in. Are the two I've used better in that respect? Is there anything else I need to watch out for? I did a search and didn't find any topics on this, sorry if this is a dupe.