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I cleaned my Aquarium filter too well recently, as after this I started to get an immediate build up of brown algae. Then added several doses of this product and it prevented the return of the algae in a very short period of time, so well worth the expense and will definitely be buying again when needed.
I add this to my treated and denitrated water before I siphon the water into my pond. Although I can't directly ask the fish how they are feeling, Stress Zyme clearly benefits the water quality and boosts the beneficial bacteria that live in the filter.
I purchased this as I've only had my aquarium 2wks and the 30ml is just under half way gone but I was told it would go quickly with how much you have to use. When this arrived was very pleased, the size should last me quite a while for how much I have to put in on a regular basis.