---
title: "Calculate fertilizer doses for an aquarium · Lenexa Learn"
description: "An aquarium hobbyist gave Gemini a known fertilizer ratio and had it build dosing tables in grams for different tank sizes. The math checked out."
url: https://www.lenexa.ai/learn/use-cases/calculate-fertilizer-doses-for-an-aquarium/
site: "Lenexa Learn"
---

Life Admin & Home

# Calculate fertilizer doses for an aquarium

An aquarium hobbyist gave Gemini a known fertilizer ratio and had it build dosing tables in grams for different tank sizes. The math checked out.

## Steps

1. Give it the ratio you already trust.
2. List your tank sizes and targets.
3. Work out one number by hand to be sure.

## Prompt you can copy

```
Using this ratio: [ratio], make a table of how much [substance] to add for [targets] in tanks of [sizes].
```

## Tools

- Gemini

For Individuals. Added October 12, 2026.

## Source

[hn](https://news.ycombinator.com/item?id=45426402) · September 2025

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