How long can shrimp go without food? Feeding shrimp while you're away
Shrimp are grazers. In an established tank they spend most of the day picking at biofilm, algae and decaying plant matter, and the food you add is a supplement to that. That's good news before a trip: a healthy, mature shrimp tank usually copes with a week or so without feeding far better than it copes with being overfed by a well-meaning helper.
Why shrimp can go without feeding
A mature tank grows its own food. Biofilm forms on every surface, soft algae grows on glass, wood and plants, and leaves and plant matter break down into food shrimp graze all day. Shrimplets live almost entirely on this film. That's why many keepers already build a no-food day into the week (see best shrimp food), and why a short break mostly means the colony cleans the tank more thoroughly.
How long, by situation
| Tank | What owners commonly report | Plan |
|---|---|---|
| Established planted tank, months old, visible biofilm or algae | About a week without food is routine; longer breaks are often fine | No feeding needed for a short trip; a leaf or a small amount of slow food for longer |
| Newer tank (a few weeks to a couple of months), little algae | Less natural food, so shrimp run short sooner | Add a leaf and a little long-lasting food, or ask someone to feed lightly |
| Tank with lots of shrimplets | Babies depend on biofilm and fine food | Leaving it unfed is usually safer than overfeeding; a biofilm-rich tank helps |
| Bare or very clean tank | Little to graze | Arrange a sitter or start building biofilm well before you go |
Before you go
- Don't feed extra. A big feed before leaving rots while you're away and can foul the water. Feed normally, or slightly less, in the last few days.
- Do a small water change a few days ahead, not the morning you leave, so any problem shows up while you're still home. See shrimp tank water changes.
- Clean the filter sponge a week or so before, not right before, and check that the filter, air pump and heater are running normally.
- Top off the water with dechlorinated water so evaporation doesn't leave the tank low or concentrate minerals while you're gone.
- Put the light on a timer so the plants and biofilm keep growing on a normal day-night cycle.
- Leave a natural grazing source. A dried leaf such as catappa or mulberry, or a small piece of a long-lasting shrimp food, gives them something to work on without fouling the water.
- Think about temperature. If the home will be shut up in summer heat or left cold in winter, plan for it. Heat is the bigger danger; see shrimp tank temperature.
Vacation feeder blocks and automatic feeders
Gel or plaster "vacation feeder" blocks are made with fish in mind and release food slowly over days. In a small shrimp tank, owners frequently report that they leave uneaten food, cloud the water or trigger a bloom of worms or planaria, and some blocks can shift water hardness as they dissolve. Automatic feeders can also jam or dump too much. If you use either, test it at home for a week first so you know exactly what it does in your tank. For most shrimp-only tanks, a leaf and no added food is the simpler choice.
If someone is checking in
- Pre-portion any food into tiny labeled packets or a pill organizer, one small pinch every two or three days, and tell them not to add more even if the shrimp "look hungry". Shrimp always look busy.
- Ask them to check that the filter and light are running and the water level is normal, and that the room isn't extremely hot or cold.
- Leave your phone number and ask for a photo if anything looks off, rather than having them try to fix it.
When you get home
Look before you feed. Check that equipment is running, count roughly how many shrimp are out grazing, and look for leftover food, cloudy water or unusual numbers of worms. Then feed a small amount and return to your normal routine over a few days, starting with a modest water change if the water looks or smells off. If you find losses, see why are my shrimp dying.
Track it
Note the date you left, what you left in the tank, and your GH, KH, TDS and temperature readings before and after on the free Water Parameter Log printable. Next time you travel you'll know exactly how your tank handles a break.
Frequently asked questions
How long can cherry shrimp go without food?
In an established tank with biofilm and algae, owners commonly report cherry shrimp doing fine for about a week without added food, and many colonies go longer. A new tank has less natural food.
Can I leave my shrimp for a week?
Usually, if the tank is established and the equipment is reliable. Don't overfeed before you go, do a small water change a few days ahead, top off the water and leave a leaf for grazing.
Should I use a vacation feeder for shrimp?
Many shrimp keepers avoid them. In small tanks, owners report leftover food, cloudy water and worm or planaria blooms. Test any feeder at home first if you want to use one.
Should I feed shrimp extra before a vacation?
No. Extra food rots while you're away and can foul the water. Feed normally or slightly less in the last few days.
What can I leave in the tank for shrimp while I'm away?
A dried leaf such as catappa or mulberry, or a small piece of a long-lasting shrimp food, gives them something to graze without fouling the water.
Do baby shrimp need feeding while I'm away?
Shrimplets live mostly on biofilm, so a mature tank feeds them. Leaving them unfed for a short trip is usually safer than overfeeding.
Sources: Shrimp Tank Hub's shrimp food, water change, temperature and planaria guides and their references; recurring owner reports on feeding while away, feeder blocks and automatic feeders (r/shrimptank and hobby forums, 2024–2026).