Seachem Reef Fusion 2 500mL
Maintain perfect alkalinity balance in your reef tank with Seachem Reef Fusion 2, a concentrated blend of carbonates and bicarbonates designed to:
- Raise and stabilize alkalinity at 4400 meq/L—critical for coral skeleton growth
- Support healthy coral development, especially when paired with Reef Fusion 1
- Provide essential carbonate ions without affecting pH
- Work efficiently in both low and high-demand reef systems
How to Use: Shake well before dosing. Add 1 mL per 25 L of aquarium water every 1–2 days into a high-flow area. Always dose separately from Reef Fusion 1 and test regularly to fine-tune your routine.
| Specification | Value |
|---|---|
| Volume | 500 mL |
| Alkalinity Level | 4400 meq/L |
| Active Ingredients | Carbonates and Bicarbonates |
| Usage Frequency | Every 1–2 days |
| Recommended Dose | 1 mL per 25 L |
FAQ
Can Reef Fusion 2 be used with other alkalinity products?
Yes, Reef Fusion 2 works well when used alongside Reef Fusion 1. However, it should be dosed separately to avoid over-supplying alkalinity.
Does Reef Fusion 2 affect the pH of the water?
No, Reef Fusion 2 provides carbonate ions to stabilize alkalinity without affecting pH levels.
How often should I test my tank’s alkalinity after using Reef Fusion 2?
It is recommended to test alkalinity regularly, especially after initial dosing, to ensure stability and adjust dosing as needed.

Ian Quinn –
I’ve used Reef Fusion 2 in my 120-liter reef tank for three months. The alkalinity stays stable, and my corals have grown stronger. I mix it with Reef Fusion 1 and it works perfectly without any pH changes. Easy to dose and reliable.
Melanie Parsons –
Good product for maintaining alkalinity. I noticed a steady rise in carbonate levels after a week of use. The instructions are clear and it integrates well with my existing routine. Slight improvement in coral coloration.
Diana McGrath –
This is a must-have for reef keepers. The alkalinity stays consistent even during water changes. I use it every two days and have not had any issues with pH or coral stress.