A fish-only tank with no live plants does not need plant fertiliser - dosing it just wastes money and can feed algae. You only need fertiliser once you add live plants. Here's the simple rule.
No live plants = no fertiliser
Plant fertilisers feed plants, not fish. In a tank with only fish and plastic or silk decorations, there's nothing to fertilise - regular water changes and good filtration keep it healthy. Adding fertiliser there can simply fuel algae on the glass and decor.
A few live plants? Dose lightly
If you keep a handful of hardy live plants (anubias, java fern, vallis) in an otherwise fish-focused tank, they'll draw some nutrients from fish waste, but a light all-in-one like Sunken Garden Green keeps them greener. Root-feeders benefit from a root tab. Not sure if you need it? See does my aquarium need fertiliser?
Fish waste vs fertiliser
Fish waste supplies nitrogen and some phosphate - helpful for plants, but it doesn't replace the potassium, iron and trace elements a planted tank needs. In a fish-only tank, that waste is simply removed by water changes and filtration, so no fertiliser is required.
Frequently asked questions
Do fish-only tanks need plant fertilizer?
No - with no live plants there's nothing to fertilise; water changes and filtration keep a fish-only tank healthy.
Will fertilizer help my fish?
No - plant fertilisers feed plants, not fish, and dosing a fish-only tank can encourage algae.
I have a few live plants with my fish - do I dose?
A light all-in-one keeps them greener, plus a root tab for root-feeders; heavy dosing isn't needed.
Do plastic or silk plants need fertilizer?
No - artificial plants don't use nutrients, so no fertiliser is required.
Doesn't fish waste fertilize plants?
It supplies some nitrogen and phosphate, but not enough potassium, iron and traces for a fully planted tank.
Can fertilizer cause algae in a fish-only tank?
Yes - unused nutrients with no plants to absorb them can feed algae, so skip fertiliser unless you keep live plants.
Adding live plants to your fish tank? Start light with Sunken Garden fertilisers from Fish Bazaar, delivered across India.
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