E-Marco-400 Mortar Review

on May 28, 2019

100% Non-Toxic - Triton ICP Tested

What is the Best live rock cement or reef cement available? E-Marco 400 surely takes the lead on many aspects of building a perfect aquascape.

Have you ever wondered how they make those remarkable aquascape structures? MarcoRocks E-Marco-400 Aquascaping Kit is how!

The kit includes everything you will need to create your own mortar that is specially modified to keep the joints from becoming brittle in saltwater. The cement, once mixed will turn into a paste-like consistency that you can then use to bond live rock together to create a permanent, long-lasting bond. Using a cement mortar can have its advantages over other adhesives, most notably the way Coralline algae spreads onto the rocks. Many types of glues, epoxies, and other polymer based adhesives will actually repel Coralline algae coverage, where MarcoRocks E-Marco-400 allows the algae to grow naturally making the seams disappear much faster than other methods.
  • Ideal for larger reef aquascapes
  • More economical than other adhesives
  • Sets in 20 minutes
  • Cures underwater
  • 2-hour handle time

Two Colors Available:

  • Grey - Cures into a light grey color that is ideal for use with live rock that is dry or does not have any coralline algae coverage.
  • Pink - Once dried gives a natural coralline algae coloration. The pink E-Marco-400 kits are perfect for artificial rock or established rock that has pre-existing coralline algae. 

What's Included?

  • 5lbs Grey E-Marco-400 Complete Mortar Kit
  • 1x Mixing Spatula
  • 1x Liquid Polymer Additive

How we use E-Marco

Here at Sea City Corals we use a verity of different rock adhesive product. Each product we use tends to work better for certain things than others. Like the putty and gels are great for nano tanks, while in our opinion the bigger aqua scape designs require something a bit more stronger.



In the near future we will be doing a comparison test on different types of adhesives and how much weight in PSI each is able to hold. We will post an article with the results and our opinion on the matter after the test.

One aspect of the Pink E-Marco to consider is when you are using rock with no coralline algae growth on it, it sticks out a bit in contrast between the pink cement and the white rock. While the pink looks great on rock with coralline algae growth on it, the gray we recommend is used on rock that has little coralline to none for the same reason. But if grey is the only option, remember that with proper water parameters and a coralline booster (if you would like to speed up the proces) the algae will cover the gray cement in no time at all.

This is a picture of a scape we built using E-Marco-400 Morta, MarcoRock Reef Saver, Foundation and Shelf rock for a 200 gallon aquarium.

As you can see the overhangs and caves have incredible depth in the design. The larger pieces of shelf rock weigh about 20-25LB each and the E Marco 400 has no problem holding them in place.

As a matter of fact the cement, if properly used, once fully cured is stronger than the rock itself.

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