How to keep jellyfish as pets in an aquarium
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If an air bubble is trapped inside one of the jellyfish, the bubble will usually break free as the jellyfish swims. If one is lodged in a jellyfish, you can manually remove it. Grab the jellyfish very gently and hold it upside down. Move it slowly 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 come out and you must release the jellyfish and try again later.
If jellyfish swim slowly, these are the first warning signs that the water quality is poor. Make sure the temperature is within 2 degrees of 77, the salinity is within 2 ppt of 30, and the ammonia is below 1 ppm. If the temperature is off, adjust the heater. If salinity is off, add fresh water or salt as needed. If the ammonia level is too high, do a 25% water change immediately.
If the jellyfish are shrinking, then they are not getting enough food. Increase your feeding dose. If the water is cloudy, there is too much food in the tank. Decrease the feeding dose. You can make your own saltwater for your jellyfish tank by mixing tap water, dechlorinator, and an aquarium salt mix. You can also buy saltwater at your local aquarium store or collect it from the ocean. When you receive your jellyfish, you’ll want to follow these acclimatization procedures:
All of our jellyfish are shipped via overnight express mail. Upon arrival, the jellyfish should be gradually introduced to their new home. First, the temperature of the water in the bag must reach the same temperature as the water in the tank. Second, the water in the bag should gradually mix with the water in the tank over a period of 30 minutes.
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 water in the bag to the same temperature as the water in the tank.
Remove the rubber bands and open the bags without letting the water escape.
Over a period of 30 minutes, gradually mix the water in the bag with the water in the tank while keeping the jellyfish in the bags. Do this by exchanging about 10% of the water in the bag with water from the tank every 5 minutes. You can tie the bags loosely with rubber bands between water exchanges.
Once the water in the bag and the water in the tank are well mixed, open the bags and let the jellyfish swim into the tank. Be sure to keep them completely submerged at all times.
Jellyfish may not swim much for the first few hours as 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 the jellyfish. Then add a half cap on the second and third days.
Perform the first water change on the fifth day by doing a 25% water change. Thereafter, do 25% water changes every two weeks.