Do Aquarium Plants Like Hard or Soft Water?

Water hardness in aquariums is an important factor for maintaining healthy aquatic life. Although most of us are familiar with the pros and cons of hard and soft water for fish, it's not always clear what effects it has on aquarium plants.

The Importance of Water Hardness for Aquarium Plants

Water hardness is determined by the amount of dissolved minerals, particularly calcium and magnesium, in the water. These minerals can either be present in abundance (hard water) or in lower quantities (soft water). They have a significant impact on the pH, nutrient availability, and general health of aquatic flora and fauna.

Aquarium plants require specific mineral concentrations in the water. If the water is too soft, plants may lack calcium and magnesium, which can cause stunted growth and eventually death. On the other hand, hard water can lead to a buildup of minerals, which can cause the water to become alkaline, making it difficult for plants to take in nutrients.

Choosing the Right Water Hardness for Aquarium Plants

The ideal water hardness for aquarium plants varies depending on the species. Some plants prefer soft water, while others thrive in hard water conditions. Researching the specific needs of your aquarium plants is the best way to determine which type of water is best.

For example, soft water plants like amazon sword and java fern prefer water with low to moderate hardness. These plants will require regular supplementation with calcium and magnesium if the water is too soft. On the other hand, hard water plants like anacharis and hornwort prefer water with higher mineral concentrations.

Adjusting Water Hardness for Aquarium Plants

If you have plants that require a different type of water than what you currently have, don't panic. Adjusting the water hardness in your aquarium can be done relatively easily.

To increase water hardness, you can add minerals like limestone or crushed coral to the tank. To lower water hardness, you can use reverse osmosis (RO) water or peat moss. It's important to do this gradually and regularly test the water to ensure you're not overcorrecting and causing harm to your plants.

The Bottom Line

Water hardness is an important factor to consider when setting up an aquarium for both fish and plants. Understanding which type of water your plants prefer and adjusting the water hardness accordingly can make a significant difference in their growth and overall health.

If you're unsure of which type of water your aquarium plants need, speak with a specialist or do some research online. By providing your plants with the right water hardness, you'll be able to create a healthy, thriving aquatic environment.