Breeding Journal, Species: Cassiopea sp. (Upside down jellyfish)

General
Species:  Cassiopea sp.
Social Structure:  Group (Plague)
Size of Individuals:  various sizes.  Most medusa I see are between about 5mm and 3 cm
Age of Individuals:  Various ages
Date added to Tank:  Unknown since I didn't intentionally add them to the tank.  I would estimate they were introduced summer of 2013

Broodstock Tank Details
Size of Tank:  12 gallon biocube
Substrate Details:  None
Filtration Details:  Sponge filter
Water Changes:  Sporadic
Water Temperature:  ~80F
Lighting:  CFL bulb
Lighting Cycle:  6AM-8PM
Other Tank Inhabitants:  Yellowstripe clingfish, green banded goby, Stenopus scutellatus pair, couple cerith snails, columbellid snails, a hermit crab that I don't know the species of...

Broodstock Feeding Details
Food Types:  Light, nutramar ova, enriched frozen artemia, Hikari mysis, live enriched artemia
Feeding Schedule:  At least two times a day

Spawning Details
Date of First Spawn:  
Spawn Time of Day: 
Dates of Consecutive Spawns: 
Courtship Details: 
Egg Size: 
Egg Color: 
Egg Count: 

Hatch Details
Hatch Date: 
Hatch Time of Day: 
# Days after Spawn: 
Larvae Description: 


Larval Tank Details
Temperature: 
Size of Larval Tank: 
Substrate Details: 
Other Tank Decor: 
Filtration Details: 
Lighting: 
Lighting Cycle: 
Water Changes: 

Larval Feeding Details
Food Types: 
Feeding Schedule: 

Metamorphosis/Settlement
Date of Settlement Start: 
Days after Hatch: 
Date of Settlement End: 
Description of Fry: 

Grow-Out Tank Details
Temperature: 
Size of Grow-Out Tank: 
Substrate Details: 
Other Tank Decor: 
Filtration Details: 
Lighting: 
Lighting Cycle: 
Water Changes: 
Size at Transfer: 
Age at Transfer: 

Grow-Out Feeding Details
Food Types: 
Feeding Schedule: 

Additional Information
(No Pictures or Videos in the Section Please)
Miscellaneous Information: 



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It seems odd to create a breeding thread/journal for something that you have spent nearly a year trying to get rid of, but I figure someone out there might want to know...
 
I don't know how I got these things.  My best guess is that they came in on some cerith snails I ordered, probably a polyp or two.  Maybe they came from somewhere else though...I feel like I have seen the polyps in other tanks, but they don't get beyond that stage and turn into full blown jellies.  Perhaps other things eat them in the other tanks. I do know at one point I saw the polyps in my paly/zoa/polyp tank but they disappeared....I figured the peppermint shrimp ate them.  I can't remember if that was before they became overabundant in the biocube or after.  
 
For the longest time I thought they were just hydroids and I would siphon them out and scrape them off.  Even when I realized that they would become jellyfish, I would siphon them out.  
 
Here are some polyp pics:


 
This pic shows a brown adult and a blue adult. I've also seen green ones in that tank.  The blue are by far the prettiest.



 
And here is a backlit shot of it (in a clear measuring cup)

 
Here is a brown one on the glass, next to a columbellid snail:

 
I do absolutely nothing special for them.  I feed the fish in the tank and they must get enough of what they need from that.  I have been working on IDing them, but Cassiopea is as far as I got.
 
 

Oh, and I should add that I don't know how big they could get. I usually siphon them out and it's also highly unlikely that I am providing the right environment for them to reach their maximum size.