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You are here: Home / Beginners Education / Reefscaping with Dry Live Rock
Dry live rock - Aquarium Dry Rock

Reefscaping with Dry Live Rock

by greg.chernoff

You knew you should have declined. But someone in the reef club was selling a huge stack of live rock for a super cheap price. A super good deal. Right when you were already preparing to set up and stock that old empty system. But this time you were going to try starting with dry base rock. Especially after the last tank, which had issues with cyano, hair algae and glass anemones from Day One (well, at least right after adding the wet live rock). But hey, you saw some pictures of the tank that it all came from, and it looked good. And it’s already cycled, you said to yourself. And it’s already got lots of coralline…

As you now had live rock waiting to get picked up and placed, you hurriedly put that old system back together. In little time your tank was flowing with seawater, lights shining bright, and piled
high with rock. With all that mature, fully cycled live rock, there was little time before you began stocking corals. One here. One there. Another, even pricier piece here… A yet pricier piece there… After a few weeks, the first of several pests and plagues would emerge.

A thin, golden-brown film that spread across the glass, sand and rock surfaces signaled a benthic diatom bloom. No worries, you thought; you shrugged it off saying, that’s normal and it’ll
go away. Most of it went away. But just after that, a little bit of green stringy stuff started to grow from the most brightly lit pockets in the rock surface. Crap! There wasn’t much of that stuff–yet–but you already knew what it was. You saw that before, just like the reddish maroon slime that started to cover rocks near the bottom of the tank. But your heart really, finally, totally sank upon first sight of that first teeny weeny baby anemone–a glass anemone. Then the coral-eating flatworms… Really?

You know it came from that dirty live rock. All of it did. When the last of the corals died, the tank went back into the garage and the rock went straight to the garbage.

[drygoods]

Dry as a Bone

Pests can turn your hobby into a chore. Avoiding them is very much preferable to dealing with them. This is why good aquarium biosecurity measures are so important. Just like practicing quarantine, buying only captive-bred, etc., the use of dry live rock is good biosecurity. Wait… so if it’s dry, how can it be “live?” In this case, the term live applies because the rock is excellent habitat for beneficial bacteria (and copepods!) as well as desirable forms of crustose algae. And because it is easily seeded with these organisms.

The usual first concern with dry base rock is with cycling. You may rest easy tonight because initiating and sustaining the nitrogen cycle with dry aquascaping material is simple as toast. First
of all, there is (unlike wet live rock) no die-off to account for. This makes for a much more controllable cycling process and also for considerably cleaner starting waters. One can seed with specially selected strains of nitrifiers using a bottled inoculant such as Fritz-Zyme TurboStart 900. A big heap of dry live rock (and/or biofilter medium) plus a healthy dose of nitrifying bacterial inoculant can get a system fully cycled and safe for livestock in less than a week! What’s more, such bottled products are completely safe and easy to use.

Wondering how to feed the starting colonies of bacteria in a fresh system? We suggest a fine, inorganic product such as NitroCycle. This product allows for fishless cycling, meaning it is unnecessary to task a cheap and hardy (though oftentimes very short-lived) fish with initiating the cycle. It is inorganic and therefore will not degrade water quality as will organic alternatives
(e.g. dead krill). It is even possible to seed those beautiful crustose algae. Using ArcReefs’s ingenious live product Coralline Algae in a Bottle, one can quickly turn the crisp, clean white of dry rock into bright pinks and purples. You can even select your choice of color (or pick both)!

Oh, but you’re a stickler for natural reefscaping materials? Then check this out. AlgaeBarn’s trusted rock supplier sources its dry live rock sustainably from the remains of an ancient coral
reef. Yup, so it’s composed of the very same stuff that live corals grow on in the wild: The skeletons of dead corals. Really can’t get more natural than that. Or sustainable!

We shall conclude by recalling one of the very best things about dry live rock: It’s totally and completely pest-free. No weird bad bugs. None of the bad algae or bacteria. No bristle worms. No significant possibility of disease transfer (even fish parasites can hitchhike on wet live rock).

No Risks!

Pull that old system back out from the garage and start one more time with dry live rock for your new reef base. Once you go dry, you’ll never say bye!

[drygoods]

Reader Interactions

Comments

  1. John says

    September 27, 2019 at 2:15 pm

    Can add this rock to my established 120 gallon reef tank?

    Reply
    • greg.chernoff says

      October 1, 2019 at 8:34 am

      Absolutely!

      Reply
    • Andrew Petty says

      March 7, 2022 at 11:51 pm

      Yes! Of course the main question would be how “established” you’r tank already is. Id you already have lots of media, like bio-bricks, then you should be fine. If you are replacing rock in your tank i suggest cycling the rock in a separate container with a heater and pump and add ammonia and nitrates like small amounts of fish food and use a starter like Dr. Tim’s or microbacter start (my recommendation) and then test your water after a few weeks for nitrates, ammonia, etc. to ensure the bacteria is working as it should. No lighting required for this but can be used if attempting to add inverts or small fish, which I don’t suggest.

      Short version it’s always best to cycle the rock for as long as you can while you plan your aquascape but if you are not removing substrate and just adding to it, you will be fine. You will still experience a small “cycle” depending on the amount of substrate already in your tank (sump and display) and the amount you are adding. For example: If you already have 200lbs in your 200 gal tank (tank into account your substrate in your sump as well if you have one. And you are only adding 40lbs more without removing anything you will be fine. If you have 100 lbs and are adding 100lbs mode then I suggest cycling in a brute trash can or something but dealers choice if you are already established. I would still get microbacter start (better version of microbacter 7 “just more potent”). Personally I dose it into my tanks regularly as a part of my doing system. During water changes as well it is always a good idea to add it just to replenish the bacteria you may have removed during the water change.

      Reply

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