A while back I got into keeping salt water aquariums and this was a steep learning curve that I was able to eventually climb with the help of many hobbyists that were willing to guide me.
It opened my eyes to the complexity of the hobby but also the amazing balance that nature preserves in the ocean.
Water chemistry is a fundamental study to a water system that needs to maintain balance in order for livestock to live. Sudden changes can cause stress and even death. For this reason I find that modern day water testing and probe based data logging/analysis to be effective.