Drip Acclimation: Moving New Shrimp into Your Tank Safely
Your new shrimp have arrived, the bag is in your hand and the tank is ready. The easiest thing seems to be opening the bag and tipping it into the tank, but in the shrimp hobby, a large share of first-week losses starts right at this moment. Drip acclimation is a simple technique that slows this transition down: an airline tube, a container and a little patience. In this article we explain how to do it, why it works, and how to adjust it for different situations.
Why can't shrimp go straight into new water?
Shrimp live in balance with the hardness, mineral content (TDS), pH and temperature of the water around them. The seller's water and your tank water are almost never the same: different tap water, different minerals, different substrate. Going from bag to tank in one move means the shrimp has to cope with all of these differences in a few seconds.
The common view in the hobby is that this sudden change causes shrimp serious stress and can lead to molting problems in particular: a shrimp may be pushed into an untimely molt, and if its new shell is not ready, it may not survive. These losses often show up not right away but a few days later, which is why they are often not linked to acclimation at all.
Drip acclimation closes this gap not in one go but spread over an hour or two. The water around the shrimp turns into tank water drop by drop.
Isn't floating the bag enough?
Floating the sealed bag in the tank for 15–20 minutes only equalizes the temperature. Hardness, TDS and pH stay exactly as they were. Floating is a good first step, but it is no substitute for acclimation.
The clock starts the moment you open the bag
During shipping, the shrimp's waste builds up in the sealed bag. Carbon dioxide that accumulates in the sealed bag keeps the water's pH low, and at low pH this waste (ammonia) is relatively harmless. Once the bag is opened and the water meets the air, the carbon dioxide escapes, the pH rises, and the same ammonia becomes more toxic.
In practice this means: once you open the bag, move the shrimp to the acclimation container and start dripping without delay. If the bag water is cloudy or smells bad, speeding up the acclimation a little is generally less harmful than keeping the shrimp in that water for a long time.
What you need
- A clean container: a food-safe plastic container or a small bucket. Do not wash it with detergent; just rinse it with water. It should be small enough that the shrimp and bag water cover the bottom, and big enough not to overflow once the water has grown two or three times.
- Thin airline tubing: the thin tubing used with aquarium air pumps. One end goes into the tank, the other into the container.
- Flow control: a small air valve on the tubing is easiest. If you don't have one, tying a knot or two in the tubing also slows the flow.
- A net or pipette: to move the shrimp at the end without carrying water over.
- A TDS meter (optional but very useful): shows how close the water in the container is getting to your tank water. For how to use one, see the TDS meter guide.
Drip acclimation step by step
- Dim the lights. The shrimp spent their trip in the dark. Lowering the tank and room lights calms them.
- Match the temperature. Float the unopened bag in the tank for 15–20 minutes.
- Move the shrimp to the container. Open the bag and empty the shrimp into the container along with their water. Remove any dead shrimp right away.
- Place the container below the tank. The drip runs on the height difference: the tank must be higher and the container lower.
- Start the siphon. Put one end of the tubing in the tank, draw water from the other end to start the flow, and place that end in the container.
- Set the rate. Adjust the valve or knot so the flow is 1–2 drops per second. You should see individual drops falling, not a thin stream of water.
- Wait and watch. Keep going until the water in the container has grown two or three times. If the container is getting close to full, pour some of the water (without the shrimp) down the sink and keep dripping. This water does not go into the tank.
- Transfer the shrimp. Move the shrimp into the tank with a net or pipette. Do not pour the container water into the tank; it still contains waste from the bag and the seller's water.
- Keep the first day calm. Keep the light dim for a while and do not feed on the first day. Details on the first days are in the shipping and acclimation guide.
How slow for which shrimp?
The same method works for every shrimp; what changes is how much you should avoid rushing. The times below are common starting points in the hobby. The bigger the difference between the seller's water and your tank, the longer you should take.
| Shrimp | Typical time | What to watch |
|---|---|---|
| Neocaridina (cherry, Blue Dream, etc.) | About 1–2 hours | Relatively forgiving, but still never tipped straight from the bag into the tank. |
| Caridina (Crystal Red, Taiwan Bee, etc.) | 2–3 hours, longer if the difference is large | Lives in soft water; very sensitive to differences in TDS and pH. Caridina care |
| Amano | About 1–2 hours | Tends to climb out of the tank in a new environment; keep the lid closed. Amano care |
Watch the water, not the clock: tracking with TDS
Sources give different figures for drip rate and duration; some recommend letting the water double, others triple or quadruple. The reason is simple: the right duration depends on the difference between the two waters. So if you have a TDS meter, the most reliable approach is to go by the measurement, not the clock.
- At the start, measure the TDS of the bag water and the tank water and note them down.
- While dripping, measure the water in the container now and then; as the reading approaches your tank's, the acclimation is nearing its end.
- If the gap between the two readings is large (for example going from hard water to soft water), slow the drip and take longer. Rushing is especially risky with Caridina.
It is also a good habit to ask the seller in advance what water the shrimp were kept in (TDS, GH, pH). If the difference is large, you can plan the acclimation accordingly.
Is it needed when moving shrimp between your own tanks?
If the values of the two tanks really are close (same water, same temperature, similar TDS), a long acclimation may not be needed; a short drip acclimation is still the safest option. Moving shrimp straight across without measuring because "it's my own tank anyway" carries the same risk if the two tanks have drifted apart over time. Measure first, then decide.
Small details that ruin an acclimation
Too fast a flow. If a thin stream of water is running from the tube, it is no longer a drip; the difference closes in a few minutes and the method loses its point. You should be able to see the drops one by one.
A container that cools down. The water in a small container can cool within an hour or two in a cool room. If the room is cold, keep the container next to the tank and away from drafts.
Walking away and forgetting it. Once a siphon starts, it does not stop; the container can overflow, or the tank can lose more water than expected. Check on it every so often during acclimation.
Sources
- Shrimp Science: How To Drip Acclimate Shrimp (hobby guide; drip rate, volume, pH change when the bag is opened)
- Shrimp Up Aquatics: Freshwater Shrimp Acclimation Guide (breeder guide; sudden change and molting stress)
- Aquariadise: How to acclimate shrimp (hobby guide)
- Gensou: How to Drip Acclimate Shrimp (seller guide; slow acclimation for Caridina)
- SKF Aquatics forum: How long to drip acclimate if parameters are very different? (hobbyist discussion; using TDS as a guide)
The values and advice in this guide reflect what is widely accepted in the shrimp hobby. They can vary with the line, your water and the breeder your shrimp came from. Make changes to your tank in small steps.
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