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Here at M.J. Aquatics we have been selling refugiums for a number of years and many customers have contacted us regarding replacing their refugium mud. So as always we have listened to our customers and now offer replacement quantities of refugium mud.

We sell it in various quantities to suit the various M.J. Aquatics refugiums and also in larger quantities for other purposes.


This listing is for sizes to suit the M.J. Aquatics 600 Refugium and the 750 Refugium (2 700g and 3 600g respectively) and larger bulk sack for sumps or reef tanks or Cichlid tanks. 

See our other listings for larger sizes to suit our other model refugiums.

The mud we use is a unique blend of Aragonite and other minerals by widely used in sumps and refugiums all around the world.

It is also an Ideal substrate for a marine reef aquariums or African Cichlids.

It’s unique properties enables the removal Nitrate Nitrite Ammonia and other fish waste.

Whilst having unsurpassed buffering capabilities: Which enables you to keep more fish and invertebrates healthier longer!

It has a maximum surface area of up to 10 000 square inches of surface area per cubic inch

Highly co-efficient uniformity which helps prevent bio-fouling.

Supports the proper pH of sea water (8.2) with the fastest reaction time.

Precision grading and enhanced internal surface area allows it to deliver more calcium carbonate buffer and essential trace elements than any other substrate.

It creates a natural biological balance to discourage nuisance algae growth.

It is in the ideal grain size for reef tanks fish aquariums  filter systems and refugiums.

Pure Aragonite: no tar and no harmful organics or impurities

Colourful accents add natural beauty to any marine aquarium.

Never needs replacement when used in a reef tank or Cichlid tank and only needs changing every 18 months – two years in a refugium. It works with natural bacteria to enhance performance over the full life of the system.

Elements Provided by Aragonite:
Calcium (Ca) 381 000 ppm
Carbonate Buffer (CO3) 590 000 ppm
Strontium (Sr) 7 390 ppm
Magnesium (Mg) 1 050 ppm
Molybdenum (Mo) 56 ppm
Potassium (K) 56 ppm
as well as Barium (Ba) Lithium (Li) Zinc (Zn) Manganese (Mn) Beryllium Sulfur (S) Aluminum (Al) Selenium (Se) Bromine (Br) and Boron (B)


Another great product brought to you in sizes you need by M.J. Aquatics helping to lower the cost of keeping fish.



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