Can somebody identify what this is????

[Reefer Robbie]

 

[BloopFish]

My best guess would be some sort of hydroid

 

[Lovemyreef2015]

It's the medusa stage of a hydroid. They usually go away on their own.

 

[Reefer Robbie]

It's the medusa stage of a hydroid. They usually go away on their own.

Are they bad like a pest or a parasite???

 

[Lovemyreef2015]

Are they bad like a pest or a parasite???

In my experience they can be unsightly when you have a lot but don't bother anything. I normally only see them in the early stages of a tank and go away within a month or two. I had them when we set up a nano tank. By week 8 they were gone and never came back.

 

[Reefer Robbie]

Will fish eat them are they edible or will they harm the fish??? Do they sting at all??? Then listen to a couple things on YouTube about them and they say some Sting and some don't but nobody says anything about fish eating them

 

[jeffchapok]

In my experience, they are harmless. As others have said, they'll disappear on their own.

 

[Reefer Robbie]

Yeah I was just wondering if they'd be a decent food source? They are actually not growing in my display they're growing in my copepod tank which I also hatch brine shrimp in the same tank