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

The Plank Automatic Feeder

87 reviews
$ 199.00


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.

Assembly/installation guide and other tips

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.  A longer custom-length tube is available here.

Looking for a simple, seconds-level resolution wall timer?  We've found this one works well, even if the initial programming is a bit confusing.  Want to add simple wifi control to the feeder and mixing pump independently?  These dual adapters allow you to plug the above-linked timer into one half and the mixing pump into the other. This way, you can override the timer with basic on/off, plus let the mixing pump run on a separate schedule if you don't want to leave it running 24/7.

Customer Reviews
5.0 Based on 87 Reviews
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  • FISH
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  • anthias
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Ryan S.
United States United States
Plank Feeder

This is a great product for feeding fish like anthias several times a day in small amounts. Use in the sump and works great.

Avast Marine Works The Plank Automatic Feeder ReviewAvast Marine Works The Plank Automatic Feeder Review
United States United States
Excellent purchase!

Been using a cheapo amazon auto feeder. Fish would hover around it all day using a small fraction of my 180 gallon display. Decided to give the plank a shot. Glad I did. Picked up some reef jerky as well. Fish dig it and I do too.. the feeder not the food.. well the fish dig the food and I dig the feeder.. lol Fish feeding seems more natural and reef like with food floating to the fish rather than the fish chasing the food. If you have $200 burning a hole on your pocket and love reef gizmos, pick one up

Alan J. Tomasetti
United States United States
Feeding fish made easier X10

Not only does this feeder accommodate Avast Marine's dehydrated products, but also other pellet foods as well. Very easy to use and when hooked up to a automatic timing it makes dosing fish food a breeze. Extremely easy to setup and the customer service was great when I had any questions or concerns!

willam w.
United States United States
Way better!

Super easy to put together, and works amazingly!

Travis H.
United States United States
The Plank Automatic Feeder

I have not put this into official use yet but from playing around with it I can say it's a great idea, I can't believe anyone has not made a design like this yet, way to go Avast! The system works great in it's trial runs and I'm sure once it is installed it will do a wonderful job dispensing food throughout the day. My only complaint is the price, this thing is crazy expensive for a 3d printed piece of equipment!