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Marco Rocks E-Marco 400 Solid Bond Aquatic Rock Mortar Complete Kit

Marco Rocks E-Marco 400 Solid Bond Aquatic Rock Mortar Complete Kit

Brand: Marco Rocks
Item Number: MRCO-E400

Regular price $42.00 On Sale

Only 8 left in stock!

Estimated Arrival: Between Jan 28 and Feb 03. *ETA for USA only. For accurate lead times, call us at 727-214-7750

Large, Custom, Or Backorder: Arrival Times May Vary.

Shipping Policy: Little or No Shipping Charges for Regular-Sized Items; We Cover Part of the Freight Costs for Large Items Shipped Nationally. See Shipping Policy.

Function: provide a readily mixable, easily applied, and concrete-strength mortar for binding rocks together for marine aquascape. Once the mortar dries and cures, it binds the multiple pieces of rock together into one solid stone piece. This mortar is also able to cure underwater if needed.

Mortar Malleable Work Time: 15 minutes after mixing

Mortar Hardening Time: 2-4 hours after setting structure in place

Mortar Full Cure Time (to fuse rocks together completely): 24 hours

  • If curing underwater, multiply the above time frames by 2
  • If mortaring large rocks together or working on overhangs, follow the "Mortar Full Cure Time" of 24-48 hours before moving or adding new pieces

What's Included:

  • 5 lbs of Mortar Powder
  • (1) Mixing Solution of Liquid Polymer
  • (1) Mixing Spatula
  • (1) Storage Bucket

What Else is Needed:

  • (1) Pair of Nitrile Gloves
  • (1) Work Surface Cover
  • (1) Disposable Plastic Cup for Mixing


  • Cover work surface
  • Put on gloves
  • Unpack all components
  • Add water to the bag of liquid polymer until almost full (ideally RO water)
  • Shake the bag until same consistency
  • Add appropriate amount of mortar powder to plastic mixing cup
  • Add in some liquid polymer solution to plastic mixing cup
  • Mix with mixing spatula until correct "pasty / wet clay" consistency is achieved
  • Add small amounts of mortar powder if too wet, and small amounts of liquid polymer if too dry
    • There's no specific measurements for this to follow, just experiment and have some fun with it :)
  • Apply mortar generously to contact points between each rock
  • Let cure for the appropriate time frame listed above
  • Once the entire structure is fully cured, it's ready to go into your tank

Have any further questions that aren't answered here? We'd love to hear from you, and learn how we can help you be as successful as possible in this wonderful hobby.

You can call in to 727-214-7750 to speak with Tyler from our team to determine how to create your Ideal Aquarium Build.

Also feel free to reach out to us at and we will aim to respond back within the next few hours.


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So...late one night I was shopping online for a new seahorse tank. I ended up on the Two Tides website & in the bottom corner it said to click for a live chat. Since it was after midnight & they’re in the same time zone, I thought no way. But I clicked anyway & sure enough I was chatting with a live person! We chatted for over an hour until he asked for my email address telling me I’d be contacted the next day. That’s when I met Tyler. He helped me with my purchase. He went above & beyond to get me the tank I wanted, even spending a day on a video chat with Pro Clear Aquatics as they searched their warehouse looking for the aquarium I wanted with a blue back. They stopped making these a while back but they found one for me! I absolutely love this aquarium & I can honestly say that Tyler provided THE best customer service I have ever experienced from an online vendor. He told me from the start that he would stay with me from start to finish & he did. He was always there to promptly answer any questions or concerns I had. I can’t say enough about how happy I am with my purchase!

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Absolutely beautiful fish tank and customer services

I am very happy with my order. The tank is very beautiful of out the box and it was well packaging with feel very safe from shipping damage.

Custom services from Two Tides Aquarium Supply was excellent. I have communicated with Tyler who had assisted me throughout the process from ordering the tank through shipping process, and what to expect on delivery day.

I am highly recommend anyone who want to get a new aquarium, to purchase from Two Tides Aquarium. Best to look for Tyler, he is a very helpful and pleasing person to contact if you have any question. I am glad that I have met him and definitely I would buy again in the future from Two Tides Aquarium supply when I need another fish tank and any other aquarium supply that I may need.

Thank you very much for a beautiful tank.


Great Customer Service

I am very pleased with not only the product I received but the service that came with it. Tyler was in constant contact with me throughout each stage of the process. He answered all questions I had and was even able to provide me with links to plumbing parts I needed for the build. We had a small hiccup with shipping (carrier's fault not Two Tides) but Tyler was able to update me throughout the day. Tyler genuinely cares about his customers and I would recommend the company to anyone looking for their next show room tank!

Great unit

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