GH vs KH Explained (Stop pH Crashes in Aquariums)

Most aquarium hobbyists hear about GH and KH in aquariums, but almost nobody explains what they actually measure or how they affect fish, shrimp, plants, and water stability. If your shrimp fail to moult, your pH crashes overnight, or your plants melt even though your water tests “fine”, water hardness is often the hidden reason. In this video, we break down GH vs KH in aquariums and explain how they control water stability, pH buffering, fish health, shrimp moulting, and plant growth. You’ll learn: • What GH (general hardness) actually measures • Why calcium and magnesium matter for fish, shrimp, and plants • What KH (carbonate hardness) does and how it stabilises aquarium pH • Why your biological filter slowly consumes KH and how that can cause pH crashes • The difference between GH, KH, and pH (and why people confuse them) • Common signs of low GH, high GH, low KH, and buffering failure • Why aquarium water parameters slowly drift over time • How to safely raise or lower GH and KH in freshwater aquariums Understanding GH and KH doesn’t just help you fix problems. It helps you build aquariums that stay stable long-term. Browse the full Dalua Fishroom range FOR tools that support water stability https://daluafishroom.com/ PRODUCTS MENTIONED IN THIS VIDEO These tools help maintain stable water chemistry and mineral balance in aquariums. Dalua Harmonic Bio Bricks https://daluafishroom.com/products/ha... Dalua Elixr Carbon https://daluafishroom.com/products/el... Browse the full Dalua Fishroom range https://daluafishroom.com/ WATCH NEXT We Built A 10ft Tropical River Aquascape in 1 Day (Before & After)    • We Built a 10ft Tropical River Aquascape i...   JOIN THE DISCUSSION What GH and KH levels are you running in your aquarium? Drop them in the comments — I’m curious to see how different tanks are set up. And if you enjoy clear, practical aquarium explanations without the confusion, subscribe for more guides from the Dalua Fish Room.