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The Plank Automatic Feeder
The Plank Automatic Feeder
The Plank Automatic Feeder
The Plank Automatic Feeder

The Plank Automatic Feeder

18 reviews
$ 199.00 $ 179.00


Dosing System for Plankton

The Plank automatic feeder represents years of our efforts to find and build a device that both serves the needs of our most delicate and selective aquarium inhabitants as well as our ability to realistically attend to their well-being.  Many reef fish and most corals have evolved to continuously eat small prey items out of the water column.  However, as aquarists, it is usually not feasible for us to administer a continuous, low-density supply of small, nutritious food items in our rapidly and heavily filtered reef aquaria.  This would mean adding small doses of thawed plankton by hand, dozens of times per day; those of us with jobs and a life know this isn’t practical.

Automate frequent, small feedings as often as you’d like

Precise feeding amounts

The Plank is specifically designed to allow this type of frequent micro-feeding technique.  We’ve found over years of testing that freeze dried plankton, from tiny rotifers and calanoid copepods to larger mysis and Euphasia sp. shrimp, serve as an excellent alternative to live and frozen food options.  Freeze-dried food is nutritionally complete, often even better than many frozen preparations.  However, it has often been difficult to administer to the typical reef aquarium due to its tendency to float for a long time after being added to water.  Even with a simple floating feeding ring, freeze dried food particles usually find their way to the surface and into an overflow box, only to be filtered out before being consumed.  Our system solves this problem by incorporating a powered mixing chamber that forces most of the food particles to become neutrally buoyant before being allowed to escape.  This results in a nearly continuous supply of freshly hydrated plankton in the water column. 


Many small high-energy reef fish such as anthias and wrasses, along with juveniles of basically every species, have low capacity, rapid digestive systems.  Once or twice per day blasts of even the highest quality frozen food often isn’t enough for them.  If the answer is continuous availability, the question becomes, how do we achieve this without sacrificing water quality by adding too much food?  In our years of searching, the automatic feeding devices out there didn’t have suitable control of either the frequency or amount of food dispensed, or both.  The common design we have all seen is the tumbling drum that dumps a pile of food into the water out of a flimsy sliding gate that always seems to move itself if you even breathe on it.  Some only offer a few feeding times per day, and if the batteries run out, you have to remember how to reprogram it with the awkward buttons.  Yes, we have a shelf full of these devices collecting dust.


Safe and Reliable

Slow dosing mechanism prevents accidentally adding large quantities of food

Silent, long lasting AC motor

Easy to service design

The Plank uses a precise auger driven mechanism that is capable of dosing micrograms of freeze dried plankton at a time.  Rather than complicate our device with yet another hard to remember programming interface, we opted to offload this to well known control systems like your chosen aquarium controller, a ubiquitous digital timer, or an inexpensive wifi-enabled, smartphone controlled power adapter.  Simply set the timer to run for as many seconds or minutes as you see fit, and let the Plank keep your aquarium continuously fed.  You’ll see your fish behave more as they would on a wild reef, a continuous feeding environment, having brighter colors and vigorous activity.


Technical Specs 

Overall Length: Feeder 5.75", Feeder sitting on Plank 7.25"

Height above aquarium rim: 5"

Clamp width: 1/8" to 3.25". Longer Plank with 5" clamp width available upon request- just note it with your order that you'd like the XL Plank.

Mixing chamber tube: 6" long, 2.375" outer diameter. This can be detached and cut as needed to optimize appearance and performance for your needs. As shipped, it assumes water level approximately 1" below aquarium rim.

Customer Reviews
4.9 Based on 18 Reviews
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Juan l.
United States United States
best feeder in the market

quietest feeder and super consistent!

Carl B.
United States United States
Innovative product

I’ve been waiting for a feeder like this. My plankton eaters, a group of Fairy and Flashers wrasses, love it. With a continuous food supply, even my polyp extension is better.

David H.
United States United States
Simply the best

This is simply the best I've ever used. I put in a mix of particulate and multiple sizes of pellets. Feeds a consistent amount even with the varied sizes of food I mix together. The feeding tube also works excellent for thawing and dispersing my homemade frozen food. I've always been disappointed in the performance of other auto-feeders I've used. Nothing but praise for this product. When I compare the performance and build quality to the many other auto-feeders I have had, this is by far the best value for the money.

Mark A.
United States United States
Best auto-feeder money can buy

Only 4 stars due to 2 issues: 1. Doesn't attach well to my RSM 130d which has an aggressive lip 2. The dispensing of food doesn't always happen at the bottom of the feeder. Fine food seems to travel up augur up the side of the plastic somewhat

Avast Marine Works

Hi Mark, Thanks for the feedback- if you can send in some pictures showing the mounting issues, we'd be happy to help you make sure it works well. We're working on similar mounting improvements for other types of tanks, one of those might suit you. Also, pics of #2 would be helpful too. Send to Thank you!

Ryan A.
United States United States
Great Product!

Far and away the best auto-feeder. For my application I wanted to have it point into the return pump in the sump. Fortunately the tube is the same outer diameter as standard 2" pvc, so I krazy glued an extension on it to get it just right.

Avast Marine Works The Plank Automatic Feeder ReviewAvast Marine Works The Plank Automatic Feeder Review
Avast Marine Works

Thanks for the feedback and pics! Please keep us up to date with how this installation (particularly the XXLong tube) works out. Also, if you'd like it to be all black, just contact us and we can custom cut an appropriate length of shiny, letter free black tube :)