90 min · module 04 of 06
Fish Care + Water Chemistry: Keep the Crew Alive
Your fish are coworkers. Treat 'em right.
Watch & Learn
Test pH for Growing Plants — DIY Hydroponics pH Kit
Learning Objectives
- 01.Test pH, ammonia, nitrite and nitrate.
- 02.Pick the right fish for your climate and goals.
- 03.Diagnose a sick tank from 3 symptoms.
Hands-On Activities
- Lab: test 3 water samples (clean, mid-cycle, crashed).
- Fish-pick game: match species to use cases.
- Case study: 'Why did the tank crash on Friday night?'
Materials
API freshwater test kit3 sample bottlesFish info cards
Vocabulary
pH
How acidic or basic the water is (sweet spot 6.8–7.2).
DO
Dissolved Oxygen — fish need ≥5 mg/L.
Tilapia
Hardy, fast-growing fish — top pick for warm water.
Discussion Prompts
- Is it ethical to raise fish for food in a classroom?
- How is caring for fish similar to caring for a community?
Check For Understanding
Q1. Healthy aquaponics pH range is roughly...
Q2. Which fish is the most beginner-friendly?
Q3. Dissolved Oxygen is important because...