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Terms and Conditions Apply!
We can ship to any address in Australia and New Zealand. Note that there are restrictions on some products, and some products cannot be shipped to some locations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full kilo.
Seachem Meridian is a premium, all-natural oolitic (spherical or egg-shaped) aragonite substrate designed for reef, marine, and tropical aquariums. Its fine, rounded grain structure creates a natural-looking seabed while providing a stable, high-quality foundation for aquatic life. Engineered to help regulate essential water parameters, Meridian aids in maintaining proper calcium levels and alkalinity, while buffering against sudden drops in pH. This makes it an excellent choice for maintaining long-term chemical stability in marine and reef systems.
Premium natural oolitic aragonite substrate
Suitable for reef, marine, and tropical aquariums
Helps regulate calcium and alkalinity levels
Buffers against large pH drops
Fine, spherical grains for a natural seabed appearance
Promotes stable water chemistry
Brand: Seachem
Product Type: Aragonite Substrate
Grain Type: Oolitic (Spherical)
Material: Natural Aragonite
Function: pH Buffering & Mineral Support
Aquarium Type: Reef / Marine / Tropical
Create a natural marine substrate base
Support stable calcium and alkalinity levels
Help prevent sudden pH fluctuations
Ideal for reef and fish-only marine systems
Use as a primary or decorative substrate layer
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