Low-tech and low-light planted tanks need light, steady fertilising - not the heavy dosing high-tech tanks use. A budget all-in-one like Sunken Garden Green, plus root tabs for root-feeders, is all most tanks need. Here's how to fertilise a no-CO2, low-light tank without triggering algae.
What low-tech plants actually need
Without CO2 injection and strong light, plants grow slowly and use fewer nutrients - so you dose less, less often. The goal is a small, consistent supply of macros (N, P, K) and micros (iron, trace), topped up weekly. Overdosing a slow tank just feeds algae (see fertiliser & algae).
Best picks for low-tech / low-light
- All-in-one liquid: Sunken Garden Green - affordable, covers macros and micros, made for Indian tanks (dose lightly, once or twice a week). Premium alternative: Seachem Flourish.
- Root tabs for crypts, swords and vallis: Sunken Garden Root Tabs or TPRS Root Boost+.
- Hardy epiphytes (anubias, java fern, moss, buce) get most of what they need from the water column - a light all-in-one is enough.
Simple low-tech dosing
Start with half the label dose of an all-in-one once or twice a week, after your weekly water change. Watch the plants - if new growth is pale or holey (see deficiency signs), nudge the dose up. Keep light modest at 6-7 hours - see our lighting guide and low-tech setup guide.
Frequently asked questions
What is the best fertilizer for a low-tech planted tank?
A light dose of an all-in-one like Sunken Garden Green, plus root tabs for root-feeding plants.
Do low-light plants need fertilizer?
A little - hardy plants like anubias and java fern get by on fish waste, but light all-in-one dosing improves colour and growth.
How often should I fertilize a low-tech tank?
Once or twice a week at a light dose, usually after your weekly water change.
Can I overdose a low-tech tank?
Yes - slow tanks use little, so heavy dosing just feeds algae. Start low and increase only if needed.
Do I need CO2 for a low-tech tank?
No - low-tech tanks skip CO2. A little liquid carbon is optional but not required.
Liquid or root tabs for low-tech?
Use a budget all-in-one for the water column, and root tabs only for root-feeding plants.
Keep a low-tech tank thriving with affordable Sunken Garden fertilisers and root tabs from Fish Bazaar, delivered across India.
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