To add fertiliser to an existing tank, start low and go slow - begin with a light all-in-one dose, add root tabs for root-feeders, watch for algae, and build up over a few weeks. Here's how to introduce dosing without upsetting a settled tank.
Step 1 - assess what you have
Note your plants (root-feeders vs epiphytes), your light level, and whether you run CO2. Look for deficiency signs (guide) - they tell you what's actually short.
Step 2 - start light
Begin with about half the label dose of an all-in-one like Sunken Garden Green or Seachem Flourish, once or twice a week after a water change. Push root tabs into the substrate near root-feeders like swords and crypts.
Step 3 - watch, then build up
Over 2-3 weeks, watch new growth and algae. If growth improves and water stays clean, increase toward the full dose; if algae appears, hold or reduce and check light and photoperiod (see fertiliser & algae). Then settle into a routine - see how often to fertilise and the dosing guide.
Frequently asked questions
How do I start fertilizing an established aquarium?
Start with about half the label dose of an all-in-one after a water change, add root tabs for root-feeders, then build up over a few weeks.
Will adding fertilizer to an old tank cause algae?
Only if you start too heavy. Begin light, watch, and increase gradually while keeping light and photoperiod in check.
Do I need root tabs in an established tank?
Yes for root-feeders like swords and crypts; epiphytes (anubias, buce) are fine on water-column liquid.
How soon will I see results?
Healthier new growth usually shows within 1-3 weeks; judge by the newest leaves.
Should I do a water change before dosing?
Yes - dose fresh, conditioned water after your weekly change for predictable results.
How much should I dose at first?
Around half the recommended dose to start, increasing toward full as plants respond.
Start dosing safely with Sunken Garden all-in-one and root tabs from Fish Bazaar, delivered across India.
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