Alg A Mic nutrient

The ingredients in algamix oxidise and turn from green to brown once it's been exposed to oxygen (=opened) and enough time passes. It's good to use for about a year, but this will already happen sooner usually. The bottle has the info on expiration. Keeping the bottle in a cool dark place slows the dolouring the most but it's still fine to use. I wouldn't worry about it, my plants never died and it turned brown before I finished the bottle. 😁

With these types of products. If you let the room temp where the products is go above 22c max, it'll go bad. That's what you are looking at. Any enzyme based nutrient needs to be stored below that. Same goes for hydro solution, now think of tat bottle is full of enzymes. So, did you keep it in a cool place? Have a smell of it. But, in general if the color changed. Then something has changed.

if its getting old he gets darker, fresh and unopened he is way light greener It has date on bottle

Yes, i have the same products (all bio bizz products) and It become darker within weeks when opened, the same with acti vera :) you don't notice it on fish mix or bio grow because they are dark brown, but basically they oxidated fast when opened :)

Eles dizem que é normal. Depende da altura do ano em que fizeram a colheita desses nutrientes. A não ser que tenha ficado exposto ao sol. 🤝