Looks like a jellyfish (It pulsed)

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It was so hard for me to get a picture so this is from google and its exactly what mine looks like.

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It looks like a Hydroid Jellyfish

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I pushed one of them off and it started to pulse.

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Hydroid Jellyfish.

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Good or bad?

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if they are brown they can be toxic. Most of the time they just disappear one day.

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filter feeder that shouldn't hurt anything

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They aren't brown, they are white.

They are really interesting. They pulse around if I knock them off and they swim back.

A lot! - I avoid fish that require frequent or specialized feeding
Votes: 22 32.4%
Quite a bit, but an automatic feeder can change my answer
Votes: 10 14.7%
It depends on whether my nutrient export can handle it
Votes: 9 13.2%
It depends on how badly I want the fish
Votes: 14 20.6%
Not much. I’m willing to adjust my routine
Votes: 12 17.6%
Not at all. Feeding demands don’t limit my stocking choices
Votes: 12 17.6%
I usually learn about the demanding feeding schedule after buying the fish!
Votes: 2 2.9%
I haven’t really considered this before
Votes: 4 5.9%
Something else (see my comments in the thread)
Votes: 2 2.9%