There is a lot of information that pertains directly to how I would use it. I can go get a book on alkalinity that will give me far more info than I actually need. This course puts it in a perspective I can understand and utilize....This module (4) was about the same as the other for me. Good information with good details where needed... (my favourite module is) The first one. I work with mostly invertebrates so it was good information to get. The other stuff I do a lot anyway ( skin scrapes, plumbing etc.). So that’s the one I didn’t have a lot of experience in.

Tasha K. Skillman, Tennessee Aquarium, USA,