i have those dry ferts for about 3 years. do you think i can still use them ?
thank you so much. any way i want to use only KNO3,KH2NO4 and CSM+B. but i showed in the pictures what i haveHi cengherbogdan,
If you are concerned about the viability they should be fine. I'm not a fan of the Aquariumfertilizer.com Macro/Micro mix because it has no phosphate. The CSM+B looks fine; the iron in the mix will darken over time from oxidation but still works.