21/08/2026
WE GET ASKED THIS EVERY WEEK…
💧 “My pH is wrong. How do I fix it?”
The short answer is: don’t chase the number!
Your fish need a stable, suitable pH, not necessarily the “perfect” number you found online. That's why you'll often see a pH range, rather than a specific number.
Things like KH (carbonate hardness), GH, your tap water and your substrate/decorations can all influence where your pH naturally sits and how stable it is.
So what should you do?
1️⃣ Test your aquarium water AND your tap water.
The API Freshwater Master Test Kit is a great all-rounder for freshwater tanks, measuring pH, high-range pH, ammonia, nitrite and nitrate.
2️⃣ Work out what your fish actually need.
Is it too high, is it too low?
Driftwood in the aquarium naturally lowers pH (softer conditions), aragonite/limestone increases pH (Harder conditions), these decorations are excellent when used to buffer conditions appropriately.
3️⃣ If adjustment is genuinely needed, make changes SLOWLY
Large, sudden pH changes can stress fish. Small, gradual adjustments are the name of the game. Aim for adjustments over a number of days.
Need help? Bring us your test results or a sample of water - we’ll help you find the cause, not just treat the symptom. 🐟
How do you manage pH in your aquarium?
Open every day 10am -6pm
📍 232-236 Bell St, Coburg VIC
🛒 www.coburgaquarium.com.au
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