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Sheet Food & Large Particle Food PreparationUpdated 2 months ago
The aF4 works best with small particle frozen foods like mysis shrimp, brine shrimp, and cyclops that seperate naturally into a pourable slurry. Larger particle foods — including clam, squid, mussel, krill, and predator mix blends — can be used successfully, but they must be prepared before loading.
Inadequate preparation is the most common reason large particle foods cause problems. Pieces that are too large will block the intake tube, clog the solenoid, or prevent the pump from drawing food reliably. Prepare the food properly and the aF4 handles these foods well. All chopping and preparation must be completed before the food goes into the reservoir.
Which foods need preparation
The following food types must be chopped before loading:
- Clam
- Squid
- Mussel
- Krill
- Large predator mix pieces
If any individual piece is larger than approximately ¼ inch (6 mm) in any dimension, it must be chopped down before loading. Foods sold in sheet form — flat frozen slabs containing a blend of meaty ingredients — almost always contain large particles and must always be prepared before loading, regardless of the brand.
How to prepare large particle food
What you'll need:
- A sharp knife or kitchen scissors
- A dedicated cutting board
- A small container for the prepared food
We recommend keeping a dedicated cutting board and knife for fish food — your household will appreciate it.
Step 1 — Partially thaw the food
Remove the food from the freezer and allow it to partially thaw — just enough to cut through, but still firm. Around 3 minutes at room temperature is usually sufficient. Fully thawed food is harder to chop cleanly and tends to fall apart rather than cut neatly.
Step 2 — Chop into small pieces
Using a sharp knife, chop the food into pieces no larger than ¼ inch (6 mm) in any dimension. Work systematically, chopping and re-chopping until all pieces are uniformly small.
Pay particular attention to:
- Fibrous or stringy pieces — these can tangle and cause blockages even when they appear small
- Flat sheet food — slice across the sheet in a grid pattern for uniform piece sizes
- Krill — remove any large shell fragments if present
The smaller the pieces, the better. Aim for a consistently fine chop rather than rough uneven chunks. If in doubt, chop smaller.
Step 3 — Load as normal
Once prepared, load the chopped food into the reservoir following the standard loading process — add a base of 20–30 mL of dilution water, add the food, then top off to the max fill line. See our Loading the Reservoir Guide for full instructions.
Tips for best results
Monitor the first few uses
Any time you use a large particle food for the first time — or try a new brand or blend — stay nearby for the first 2–3 feed cycles to confirm the food is dispensing correctly. Clogs from large particle foods, if they occur, will typically show up in the first few feeds. If you notice reduced flow or no output, run a Feed Now cycle and check the intake tube position.
Set a higher feed quantity
Set the feed quantity to 30–50 mL when using large particle foods. A higher volume feed moves food more reliably through the system and reduces the chance of a blockage at the solenoid or intake.
Mix with a small particle food
Combining a large particle food with a small particle food like mysis shrimp or brine shrimp helps the slurry flow more freely and reduces blockage risk. A 50/50 mix by volume is a good starting point.
Foods that cannot be made compatible
Even with thorough preparation, some food types are not suitable for the aF4:
| Food type | Reason |
|---|---|
| Pellets | Will not break down into slurry — will clog the system |
| Flakes | Not designed for frozen food feeders — will not dispense reliably |
| Freeze dried food | Expands in water and blocks tubing |
| Gel food | Consistency is incompatible with the pump and solenoid |
| Live food | The aF4 is a frozen food feeder only |
See our Compatible Foods & Brands Guide for the full list of recommended and incompatible food types.
Related articles
- Loading the Reservoir Guide — quick load, max fill, and dilution
- Compatible Foods & Brands Guide — recommended foods and brands
- Food Not Dispensing Guide — troubleshooting blockages and flow issues
- Auto-Clean & Deep Cleaning Guide — cleaning after large particle food use
Questions about food preparation? Submit a support ticket and our team will help.