Can anyone describe what type of medicine/chemical is this, and what is its mechanisms of action? It's commonly sold under Tetra's Lifeguard 'All-in-one' treatment. I used it a very long time ago when I had a betta and goldfish with bacteria infection / fungal. It seemed to work. I have renewed curiosity after going into a random Petco not near me. They had an Instant Ocean brand of it on the shelf. (both marineland brands).