When I started in the hobby, deep sand beds were trending towards the end of being in vogue…that is, I guess if one could ever consider deep sand beds to ever have been in vogue. As a side note here, I don’t think I’ve ever used the phrase in vogue before, but now I’ve done it three times in the span of 60 words, but I digress.
At the moment, I’m feeling like one of those old guys clinging on to the way things used to be, wondering, are deep sand beds just a thing of the past?
I wonder if I’m the only one left in the hobby with a tank that has a deep sand bed.
What you will find in this article
Advantages of deep sand beds
From my perspective, a deep sand bed carries a few advantages over a bare bottom tank.
Water purification advantages
From a water chemistry and purification perspective, what I love, love, love about my deep sand bed is that there is a ton of surface area for both aerobic and anaerobic bacteria to live and grow. Those bacteria turn ammonia into nitrite and nitrite into nitrate, essentially becoming a fantastic live sand.
“But Al,” you’re about to say, “the bacteria in my tank do the same thing, and I don’t have a deep sand bed.”
Very true, but allow me to finish. Deep within my sand bed are anaerobic bacteria—bacteria that grow only in the absence of oxygen. Those bacteria actually remove nitrate from the water.
My deep sand bed acts as another living water purification system and helps clean my water for me.
Aesthetic/Interest advantages of deep sand beds
In addition to the functional benefits to water chemistry just described, here is another reason I love my deep sand bed:
Critters. Yup. Critters. All sorts of critters. Green stuff, brown stuff, little worms, little pods. One of my favorite things to do is take a look at my sand bed at night to see what’s moving around down there. I don’t know exactly what all that marine life does…but I have to think they’re also turning one sort of waste product in my tank into their food and processing it for me.
Last, but not least, my deep sand bed is home to some other pretty fun animals—my burrowing fishes. At different points in time, I’ve kept jawfish and engineer gobies, which are fascinating to watch. The gobies seem to never stop building, and the jawfishes are just amusing to watch, as they bob up and down, afraid of their own shadows.
The downsides to having a deep sand bed
At one point, I did lose some coral tissue (not the whole animal), because a goby pair insisted on burying it, day after day until I moved it far enough up.
The sand does get dirty, from time to time. If you’re a complete neat-freak that has a low tolerance for any brown stuff in the tank, this might not be the look for you.
Last, but not least, is something I haven’t seen written about in a long time, probably because not a lot is written about deep sand beds these days—but the older literature talks about a risk of old tank syndrome or the leaching of toxic chemicals from that anaerobic part of the bed that I’m oh, so proud of.
I’m not sure if it’s the diggers that have kept me in the safe zone, just dumb luck, or if a tank catastrophe is about to happen at any moment (no doubt accelerated here by ‘jinxing’ it and writing about it right now), but the fact remains that my current tank has been running for somewhere around 8-9 years, at this point, with a deep sand bed, and it’s as alive and vibrant as ever.
I guess I’m a bit old school. I’ve certainly always been stubborn, but I love my deep sand bed and I’m convinced it provides a level of biological filtration and stability that allows me to be a little more laid back about all the maintenance.
Am I the only one out there? Let me know what type of sand bed you have with a comment below.