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If an air bubble is stuck inside one of the jellyfish then usually the bubble will release as the jellyfish swims around. If one is lodged in a jellyfish you can manually get it out. Grasp the jellyfish very gently and hold it upside down. Slowly move it around at different angles to try to find the angle that will allow the bubble to escape. If the jellyfish retracts its oral arms the bubble will not be able to get out and you should release your jellyfish and try at a later time.
If the jellyfish are swimming slowly these are the early warning signs that water quality is low. Make sure temperature is within 2 degrees of 77, salinity is within 2 ppt of 30, and ammonia is below 1ppm. If temperature is off, adjust the heater. If salinity is off, add fresh water or salt as necessary. If ammonia is too high, do a 25% water change immediately.
If the jellyfish are shrinking then they are not getting enough food. Increase their feeding dosage. If the water is cloudy then there is too much food in the tank. Decrease the feeding dosage. You can make your own salt water for your jellyfish aquarium by mixing tap water, dechlorinator and an aquarium salt mixture. You can also buy salt water from your local aquarium shop or collect it from the ocean. When you receive your jellyfish, you will want to follow these acclimation procedures:
All of our jellyfish are shipped through the mail via overnight express. Upon arrival, jellyfish must be gradually introduced to their new home. First the temperature of the bag water must reach the same temperature as the tank water. Second, the bag water must be gradually mixed with the tank water over a 30-minute period.
Submerge the bags containing the jellyfish in the tank water. Keep the bags sealed and let them float in the water for 30 minutes. This will bring the bag water to the same temperature as the tank water.
Remove the rubberbands and open the bags without allowing any water to escape.
Over a 30-minute period, gradually mix the bag water with the tank water while keeping the jellyfish in the bags. Do this by exchanging about 10% of the bag water with tank water every 5 minutes. You can loosely tie the bags with rubber bands in between water exchanges.
Once the bag water and tank water are thoroughly mixed, open the bags and allow the jellyfish to swim out into the tank. Be sure to keep them completely submerged at all times.
The jellies may not swim much for the first several hours while they acclimate to their new home. Once the jellyfish are comfortable, they will swim almost constantly.
Add a capful of Cycle to the tank immediately after adding jellyfish. Then add half a capful on the 2nd and 3rd day.
Do the first water change on the 5th day by doing a 25% water change. Thereafter do 25% water changes every two weeks.
Source by Alex Andon