Floating copepods?

[kbsharp]

Hi Reefers,

Wanted to know are these copepods or what they seem to swim around on the surface ?

 

[WestMI-Reefer]

Pics?

 

[kbsharp]

Pics?

Trying to upload a video and it won't take the video

 

[kbsharp]

Pics?

Managed had to shrink it

 

[jabberwock]

Useless, but following

 

[homer1475]

Better question would be why the top of your water is so stagnant?

 

[kbsharp]

Better question would be why the top of your water is so stagnant?

I stopped the pump to try take a video as they swim around too much

 

[homer1475]

Copepods typically stick to hard surfaces(not free swimmers). Hard to tell from the vid, but it could be brine shrimp.

 

[DaJMasta]

Medusa stage hydroids. They're sessile when adults but have a mobile larval stage that you're seeing that looks like a jellyfish. They generally don't last with pumps and hungry fish and such, so they shouldn't be a problem (and typically you see them most often in new tanks), but they're not copepods, they're actually more closely related to corals (still cnidarians.)

 

[kbsharp]

Medusa stage hydroids. They're sessile when adults but have a mobile larval stage that you're seeing that looks like a jellyfish. They generally don't last with pumps and hungry fish and such, so they shouldn't be a problem (and typically you see them most often in new tanks), but they're not copepods, they're actually more closely related to corals (still cnidarians.)

Are they harmful? I don't have any fish yet building up my tank with coral at the moment and 2 nassarius snails 1 hermit crab, the nassarius snails lay loads of eggs but heard their survival rate is almost none so didn't think it's any thing to do with them

 

[DaJMasta]

While there are kinds of hydroids that are a problem, and I've seen these same things in my years old tank so they clearly are sticking around for a bit, most people see these or ones like them early in the process and very few have issues with hydroids, so I would say they are unlikely to be an issue or something you regularly see in a month's time.