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Originally Posted by justinl
they have a mild sting compared to other jellies... not really that poisonous at all really. they are really cool animals but not many keep them in home aquaria for some reason; probably just because they aren't shipped often although they are really easy to collect and are abundant where they occur. They don't ship well because they're fragile though, so make sure the one(s) you buy are healthy. I've actually been meaning to try my hand at these guys one day.
I talked to the Vera Cruz aquarium curator and they actually keep these in brackish water; they'll do fine in full salt though. just a thought if you want to save on the cost of salt. you would have to acclimate for over a month to change tank salinity though... the slower the better. The guy says they're super easy to keep given the right conditions (see below) and actually has them reproducing quite often.
Set ups don't have to be super specialized but upside down jellies are soft bodied and mobile so cover any grates/intakes with filter floss or sponge to avoid ending up with sushi. low flow. mobility+stinging cells = non-reef safe; no corals, but they can co exist fine with others of the same species (if your store has multiple specimens). You *might* get away with the most peaceful of corals like green star polyps or zoos though. photosynthetic so halides are a MUST; the brighter the better since they'll be on the bottom of the tank most of the time but get most of their nutrition through photosynthesis. they do appreciate occasional feedings though. Needs a fairly large open soft (oolitic) sandy bottom; no crushed coral.
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Great info.
I would think they would need their own tank, or would they be ok with other fish? Just curious.