You may notice your jellies starting to curl up and move their bells in an erratic, clockwise or counter-clockwise rippling fashion instead of a normal pulse. We like to call this symptom “the Jellyfish Jig” and it indicates trouble in your tank.
The cause is linked to nerve damage in your jelly, which can arise is several ways.
-Your tank pH spiked suddenly: If you’re having pH problems in your tank, you have to adjust the chemistry slowly. If you add a ton of buffer or change too much carbon all at once, it may bring your pH up too quickly. Jellies always need to be acclimated to new conditions, even within the same system, so even though your goal is a pH of 8.0-8.2, you don’t want to get it there in a few minutes.
-Your jellies experienced sudden temperature change: If you took your jellies out of your tank for a major cleaning and dumped them right back in, or if you did your weekly change with some water from your refrigerator, that can have serious consequences for your jellies. Again, they require stable conditions to be happy and healthy. Always be mindful of temperature when your jellies are going to experience changes in their water.
-Your jellies’ food is too acidic: If you use shelf-stable jellyfish food, or you allow your frozen or refrigerated food to spoil, it can be highly toxic to your jellies. Live food is always best, frozen enriched food is a close second, but using anything below that in quality poses the risk of poisoning your system.
-Your jellies were stuck to the bottom or side of your tank for too long: If your tank flow is dialed down too low or your jellies are getting too big for their system, you may see them start to get stuck to the walls of their space like a suction cup. When this happens, they can no longer exchange nutrients and gases with their environment, so they will start to degrade. Not to mention, they will continue attempting to bell, which can lead to them pulling out their own oral arms. If you see them stuck to the sides or bottom, gently squirt some water at them with a clean turkey baster from a diagonal position to try and lift them off (be sure not to squirt all the water out because that can create problematic air bubbles). If that won’t work, gently nudge the edge of their bell with the end of the baster or another clean, rounded object.
In most cases, your jellies won’t be able to recover from this condition, but you can at least prevent it from happening to future jellies or any survivors.
1 thought on “The Jelly Jig, A Dance of Nerve Damage”
Hi. In a public aquarium I have also had this caused by high levels of heavy metals, in my case zinc, it affects the pacemakers that coordinated the pulse resulting in an uneven contraction. Poly pads removed the zinc so the others were not affected but the ones displaying these symptoms did not recover.