Great Aquariums Start Here
1-800-566-3474
    Free Shipping On $175+
  • FREE Shipping On $175+
  • 14-Day Low Price Guarantee
  • 14-Day Low Price Guarantee
  • Same Day Shipping
  • Same Day Shipping
FREE Shipping on Orders Over $175
FREE Shipping on
Orders Over $175
Standard ground shipping (1-7 business days) starts at a low $5.99 and most orders over $175 ship FREE. Learn More
14-Day Low Price Guarantee
If you find a product we sell for a lower price at another online store, we will match their price—today and up to 14 days after you've purchased the item! Learn More
Same Day Shipping
Same Day Shipping
We promise to ship your order as fast as humanly possible. In fact, 99% of orders placed before 6 pm EST ship the same day! Learn More
Shop by Category
0
Your cart is currently empty.

Aquarium Substrate & Calcium Reactor Media & Refugium Mud

Substrates
Brightwell Aquatics KoraLagoon Substrat (Substrate)
A blend of high-purity aragonite particulate grades to simulate the natural substrate particle profile of tropical reef lagoons.
CaribSea Substrate
Highest quality aragonite sand for your marine aquarium. Many different grain sizes to choose from, also available as live sand.
CaribSea Calcium Reactor Media
A complete reactor media containing not only calcium and carbonate, but essential trace elements as well.
EcoSystem Aquarium Miracle Mud
Miracle Mud is a product of EcoSystem Aquarium® that has been carefully formulated to include all the essential trace elements, minerals, and components necessary to maintain a successful aquarium.
Freshwater Planted/Cichlid Substrates
Ideal substrate for freshwater aquariums with live plants. Helps grow healthy and vibrant freshwater plants.
Two Little Fishies ReBorn Coarse Aragonite Calcium Reactor Media
Reborn™ coarse aragonite media for calcium reactors, composed of fossil skeletons of reef building corals sustainably harvested from pristine sites in the Western Pacific.
Live Rock and Dry Rock
AquaMaxx Dry Reef Rock
AquaMaxx Dry Reef Rock is a 100% natural, eco-friendly live rock alternative that is perfect for all marine fish and reef aquarium systems.
CaribSea Rubble Zone
The sky’s the limit for uses of this clean, high quality aragonitic rubble. For saltwater, the Rubble Zone can be used for attaching coral frags, refugiums, biological media, reef tank substructure, cryptic zones, or even jawfish habitats.
CaribSea South Seas Aquascaping Base Rock
South Seas Lace Rock is a great new aquascaping rock—more structure than any other commonly available aquascaping rock and is much more porous. Perfect alternative to live rock or can provide a very attractive base for live rock.
Fiji Best Saltwater Aquarium Live Rock
Fiji’s Best Saltwater Aquarium Live Rock is handpicked high-quality live rock collected from marine environments in Fiji.
Real Reef Live Rock
Real Reef is a 100% coral reef eco-friendly product made and farmed in the U.S.A. Real Reef Rock allows the aquarist a natural realistic alternative to wild live rock, without destroying the coral reef habitat

Substrate is often used for cosmetic reasons to create a natural-looking environment inside the aquarium. But in addition to cosmetics, aquarium substrate plays a vital role in biological filtration by providing surface area in which nitrifying bacteria can grow.

Larger grain sizes—often referred to as crushed coral—are frequently used in fish-only aquariums because they allow for easier removal of detritus by vacuuming the substrate. In the reef aquarium, finer grains—generally referred to as sand—are used since the substrate provides a larger surface area that does not need to be vacuumed.

CaribSea Arag-Alive substrate contains nitrifying bacteria that 'seeds' an aquarium to speed up the cycling process. For fine substrate, 90 pounds covers a cubic foot. For coarser grains, 70 pounds covers a cubic foot. If you need help deciding how much substrate you’ll need, don’t hesitate to contact us for advice.

Along with saltwater aquarium substrate, you’ll also find calcium reactor media, refugium mud and specialized gravel for freshwater planted aquariums in this section.

This item is temporarily unavailable but will be back in stock soon.

Item #
Price:
Click the Add To Cart button below if you'd like to reserve this item today. Any other items included in your order will be immediately processed and shipped. We will ship this item separately as soon as it arrives. We will not charge you for this item until it ships and you will incur no additional shipping charges.

Enter your email address in the field below and click the Notify Me button if you'd like us to send you an email when this item becomes available. Although you will be immediately notified when we have stock on hand, we will not reserve any units for you; you must return to our website and place an order.

Your Email:
Just enter your email address below and we'll let you know when the product you are looking for becomes available!

Item Code:
Price:
Your Email:
Email Specials
Subscribe to our newsletter feed.
Newsletter Tips & Tricks! New Products!
Discounts & Promos!
Testimonials
July 21, 2014
"Excellent service and quick delivery. Will continue to do business with Marine Depot."
holguinsauto

July 19, 2014
"I appreciate Marine Depot's price matching. Keeps me coming back to them with my business."
Davileet

July 17, 2014
"Support quickly answered questions I had and the product was quickly shipped. I would definitely order from them again."
scott_hout