Acclimation Procedure Guidelines
You've invested
valuable time and money researching the habitat requirements of the fish and
corals you wish to house. Naturally, you want to protect this investment by
executing a proper acclimation process once the specimens arrive at your
door. The purpose of acclimation is simple: the water that the fish or
corals are packaged in has different temperature, pH, and salinity
parameters than your aquarium. Fish, and especially invertebrates (including
corals), are very sensitive to even minor changes in these parameters, so
proper acclimation is the key to ensuring their successful relocation.
We recommend
either of the two acclimation methods explained below, and wish to remind
you the acclimation process should never be rushed.
Also, remember to keep your aquarium lights off for at least four hours
after the specimens are introduced into the aquarium to help them further
adjust.
Floating Method
- Turn off aquarium
lights.
- Dim the lights in
the room where the shipping box will be opened. Never open the box in
bright light - severe stress or trauma may result from sudden exposure
to bright light.
- Float the sealed
bag in the aquarium for 15 minutes (Fig. A). Never open the shipping bag
at this time. This step allows the water in the shipping bag to adjust
slowly to the temperature in the aquarium, while maintaining a high
level of dissolved oxygen.
- After floating the
sealed shipping bag for 15 minutes, cut open the bag just under the
metal clip (Fig. B) and roll
the
top edge of the bag down one inch to create an air pocket within the lip
of the bag. This will enable the bag to float on the surface of the
water (Fig. C). For heavy pieces of live coral that will submerge the
shipping bag, place the bag containing the coral in a plastic bowl or
specimen container.
- Add 1/2 cup of
aquarium water to the shipping bag (Fig. D).

- Repeat step 5 every
four minutes until the shipping bag is full.
- Lift the shipping
bag from the aquarium and discard half the water from the bag (Fig. E).
- Float the shipping
bag in the aquarium again and proceed to add 1/2 cup of aquarium water
to the shipping bag every four minutes until the bag is full.
- Net aquatic life
from the shipping bag and release into the aquarium (Fig. F).
- Remove the filled
shipping bag from the aquarium and discard the water. Never release
shipping water directly into the aquarium.
Drip Method

This method is considered more advanced. It is geared toward sensitive
inhabitants such as
corals,
shrimp,
sea stars, and
wrasses. You will
need
airline tubing and
must be willing to monitor the entire process. Gather a clean, 3 or 5-gallon
bucket designated for aquarium use only. If acclimating both fish and
invertebrates, use a separate
bucket for each.
- Start with Steps
1-3 of the floating method to acclimate water temperature.

- Carefully empty the
contents of the bags (including the water) into the buckets (Fig. G),
making sure not to expose sensitive invertebrates to the air. Depending
on the amount of water in each bag, this may require tilting the bucket
at a 45 degree angle to make sure the animals are fully submerged (Fig.
H). You may need a prop or wedge to help hold the bucket in this
position until there is enough liquid in the bucket to put it back to a
level position.
-
Using airline tubing, set up and run a siphon drip
line from the main aquarium to each bucket. You’ll need separate airline
tubing for each bucket used. Tie several loose knots in the airline
tubing, or use a plastic or other non-metal
airline control valve,
(Fig. I), to regulate flow from the aquarium. It is also a good idea to
secure the airline tubing in place with an
airline holder.

- Begin a siphon by
sucking on the end of the airline tubing you'll be placing into each of
the buckets. When water begins flowing through the tubing, adjust the
drip (by tightening one of the knots or adjusting the control valve) to
a rate of about 2-4 drips per second (Fig. J).
- When the water
volume in the bucket doubles, discard half and begin the drip again
until the volume doubles once more – about one hour.

- At this point, the
specimens can be transferred to the aquarium. Sponges, clams, and
gorgonias should never be directly exposed to air. Gently scoop them out
of the drip bucket with the specimen bag, making sure they’re fully
covered in water. Submerge the bag underwater in the aquarium and gently
remove the specimen from the bag. Next, seal off the bag underwater by
twisting the opening, and remove it from the aquarium. Discard both the
bag and the enclosed water. A tiny amount of the diluted water will
escape into the aquarium; this is O.K. Also, to avoid damage, please
remember never to touch the "fleshy" part of live coral when handling.
NOTE:
Most invertebrates and marine plants are more sensitive than fish to changes
in specific gravity. It is imperative to acclimate invertebrates to a
specific gravity of 1.023-1.025 or severe stress or trauma may result. Test
specific gravity with a
hydrometer or
refractometer.
Important
Facts
- Be patient -
never rush the acclimation procedure. The total acclimation time for
your new arrival should take no longer than one hour.
- Always
follow the acclimation procedure even if your new arrival appears to be
dead. Some fish and invertebrates can appear as though they are dead
when they arrive and will usually revive when the above procedure is
followed correctly.
- Never place
an airstone into the shipping bag when acclimating your new arrival.
This will increase the pH of the shipping water too quickly and expose
your new arrival to lethal ammonia.
- Keep
aquarium lights off for at least four hours after the new arrival is
introduced into the aquarium.
- Most
invertebrates and marine plants are more sensitive than fish to salinity
changes. It is imperative to acclimate invertebrates to a specific
gravity of 1.023-1.025 or severe stress or trauma may result.
- Sponges,
clams, scallops, and gorgonias should never be directly exposed to air.
Follow the acclimation procedure, but instead of netting the specimen
out of the shipping bag, submerge the bag underwater in the aquarium and
remove the marine life from the bag. Seal off the shipping bag
underwater by twisting the opening, and remove it from the aquarium.
Discard both the shipping bag and the enclosed water. A tiny amount of
the diluted shipping water will escape into the aquarium. Don't be
alarmed; this will have no adverse affect on the tank inhabitants.
- In some
instances, your new tank mate will be chased and harassed by one or all
of your existing tank mates.
Solution 1: A plastic spaghetti strainer (found at your
local discount store) can be used to contain a tank bully within the
aquarium for several hours until the new arrival adjusts to its
surroundings. Just float the perforated plastic basket in the aquarium.
Net the tank bully and place in the floating basket for approximately
four hours while the new arrival adjusts to your aquarium. Never place
the new arrival in this basket; the new specimen must get familiar with
your aquarium. By placing the tank bully in a perforated basket, you'll
reduce the stress on your newest tank mate.
Solution 2: A perforated plastic lighting grid can be
purchased at your local hardware store to cut down the width of your
aquarium. This grid may be used to section off a small portion of the
aquarium to separate territorial or aggressive fish from the newest tank
mate. After the new addition adjusts to the unfamiliar environment, the
divider can be removed.
-
Some live corals produce excess slime when shipped.
After the acclimation procedure is followed, hold the coral by the rock
or skeletal base and shake the coral in the shipping bag before placing
into the aquarium. To avoid damage, please remember never to touch the
"fleshy" part of a live coral. Many species of coral will not open for
several days after introduction into their new home. Please allow
several days for the coral to adapt to the new conditions in the
aquarium.