Guide · Automatic feeders
Drum vs compartment fish feeders
Drum and hopper feeders meter food from one container; compartment feeders drop pre-filled meals. How each sets a portion, what capacity means, and which suits you.
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Short answer
A drum feeder holds one supply of food and meters out a portion each time it turns; you set the size with an opening or slider. A compartment feeder holds a fixed number of pre-filled meals and drops one at each mealtime. Drums hold more food and suit flakes and small granules; compartments make each meal visible and fixed, but limit how many meals you get. No independent data shows either design to be more reliable.
How a drum feeder portions food
A drum feeder rotates a food container past an opening. How much falls out depends on the opening size, the food and how many times it turns.
The EHEIM autofeeder is a typical example:
- It holds about 100 ml and EHEIM describes it as mainly for flake food.[1]
- A slider on the drum changes the size of the opening to set the portion.[2]
- It can feed up to four times a day, and each feed can rotate the drum once or twice, one minute apart. For larger amounts EHEIM suggests the two-rotation setting.[2]
Other single-container feeders state similar figures. Aquarium Co-Op says its Auto Feeder holds about 200 ml and can feed up to four times a day.[3] From 3/26/26 it ships with a second precision feeding port for smaller foods.[3] hygger lists its HG169 in 350 ml and 500 ml sizes, for dry food up to 3 mm in diameter.[4]
How a compartment feeder portions food
A compartment feeder holds meals you pre-fill one by one, and releases one at each mealtime.
The Fish Mate F14 uses pre-filled rotor compartments with mealtime pegs set on a clock knob; four pegs are supplied. Each meal is dispensed gradually over about two hours.[5] Closer Pets, which now sells Fish Mate, says it can feed one to four times a day for up to 14 individual meals.[6]
Side by side
| Drum (single container) | Compartment | |
|---|---|---|
| How a portion is set | Opening size, rotations, food flow | What you put in each compartment |
| Capacity | Stated in ml (about 100 ml for EHEIM's, about 200 ml for Aquarium Co-Op's) | Stated in meals (up to 14 for the F14) |
| Food it suits | Flakes, granules and small pellets, within the maker's guidance | Whatever fits a compartment and stays dry |
| Easy to see what is left | Partly, through the container | Yes, meal by meal |
| Main thing to watch | Portion drift and clumping in a shared supply | A limited number of meals |
Capacity is not trip length
A capacity figure tells you how much food fits, not how long it lasts. Days covered depends on your portion, the number of feeds a day and the food. Only a trial with your own settings shows it. A compartment feeder's meal count is easier to plan with, but it caps the trip at that many feeds.
Neither design has reliability data
We found no independent, standardized repeatability or failure-rate data for any consumer feeder of either type. Maker phrases about accuracy or peace of mind are marketing. Whichever you choose, run it at home first; Fish Mate recommends fourteen days of supervision for a new F14.[5] See how to test a feeder before a trip.
Which to choose
- Flake food, frequent small feeds, a longer gap between refills: a drum or single-container feeder, set and tested with your food.
- Fixed meals you can count, or food that does not meter well through a drum: a compartment feeder.
- Tiny foods for small fish: look for a feeder that states a port or setting for small foods, and test it with that food.
The F14 is the compartment feeder in our catalog. It sits over a hood's feeding hole or on two supplied clamps on tanks without a hood.[5]
Next
Questions
Which is more accurate, a drum or a compartment feeder?
No independent data compares them. A compartment feeder drops what you put in each compartment, while a drum feeder's portion depends on the opening setting and how the food flows, so a trial at home is the only way to see how consistent yours is.
How many days will a 100 ml feeder last?
Capacity is not trip length. It depends on the portion, the number of feeds a day and the food. EHEIM states about 100 ml for its standard autofeeder, mainly for flake food; how many days that covers is something only your own trial can show.[1]
How many meals does the Fish Mate F14 hold?
Closer Pets, which now sells Fish Mate, says the F14 can feed one to four times a day for up to 14 individual meals.[6]