Store aquarium fertiliser in a cool, dark place with the cap tight and out of sunlight - liquids stay good for a year or two, while dry salts and root tabs last much longer if kept dry. Here's how to keep yours fresh and how to tell when it's past it.
How to store it
- Cool and dark: a cupboard away from heat and direct sunlight - light slowly degrades iron and trace elements.
- Cap tight: air and moisture shorten shelf life, so keep bottles like Sunken Garden Green and Seachem Flourish firmly sealed.
- Keep dry products dry: root tabs and dry EI salts last a very long time in an airtight container.
- Out of reach of children and pets.
How long does it last?
Unopened liquid all-in-ones generally keep for one to two years; once opened, use within several months to a year for best results. Liquid carbon and dry products last well beyond that. When in doubt, buy a size you'll use up within a season or two.
Signs it's gone off
Cloudiness, floating mould, a heavy precipitate that won't remix, or a foul smell mean it's time to replace it. A little settling that mixes back in when you shake the bottle is normal and fine to use.
Frequently asked questions
How should I store aquarium fertilizer?
In a cool, dark place with the cap tight, away from sunlight and heat; keep dry salts and root tabs airtight.
How long does aquarium fertilizer last?
Unopened liquids keep 1-2 years; opened bottles are best used within several months to a year. Dry products last much longer.
Does aquarium fertilizer expire?
It slowly loses potency, especially trace elements exposed to light - it doesn't turn dangerous, but works less well.
Do I need to refrigerate fertilizer?
No - a cool cupboard is enough; refrigeration isn't required.
How can I tell if fertilizer has gone bad?
Mould, cloudiness, a foul smell, or precipitate that won't remix mean replace it.
Is it normal for fertilizer to settle in the bottle?
Yes - light settling is normal; just shake before dosing. Only worry if it won't remix or smells off.
Stock up on long-lasting Sunken Garden fertilisers and root tabs from Fish Bazaar, delivered across India.
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