Jellyfish or Squid

Jellyfish generally need specialized tanks, more specifically a Kreisel tank. In these tanks, the flow of the water keeps jellyfish suspended, and the water enters and exits in a way so that the jellyfish are not tumbled or sucked in. I think the most commong jellyfsh that would be sold for aquarists would be Moon jellyfish, which require a constant supply of live planktonic food. I have seen a large mangrove style tank with jellyfish, but once again they are generally difficult to keep being that they are so delicate.

Squid/cuttlefish generally don't survive being transported well, and are probably best in the tank of an advanced hobbyist, or better, left in the ocean. Even if they survive, they tend not to live long, especially in captivity.
 
There's a cephalopod forum a bit lower... Unfortunately I don't have any links on the subject you're interested in handy, and biochemistry's a callin. There are number of people who breed cuttle fish, though.
 
I think they could tint up the carper pretty fast. Perhaps if you built a squiddel (you know, like a kennel).

Try http://www.tonmo.com/ or google search terms like "breeding cuttlefish" or something similar. Should have no problem finding at least a few people. :)
 
I've never heard anyone keeping squid, but people do keep cuttlefish (go here for some info). One thing to keep in mind is that most tropical cephalopods only have a lifespan of a year or so.

Unfortunately, like the above poster said, moon jellyfish require specialized tanks. You can get a kreisel made (www.midwatersystems.com sells them), or you can try to make a psuedo-kreisel. Most public aquariums feed their moon jellyfish newly hatched brine shrimp, so that would mean hatching brine shrimp every day. Finally, moon jellyfish require tempratures in the 60s, so you would need a big chiller.

A less difficult jellyfish would be the Cassiopea spp. They are tropical, so they wouldn't require a chiller, and they're photosynthetic, so you wouldn't have to feed them, but they do need pretty powerfull lights, like what corals would need. The downside is that they aren't really what most people envision when they think about jellyfish (Here's a picture of one)


This article covers just about everything you would want to know.
 
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