thing in sump, what is it

[sjarea88]

I have a sump and portion is covered and shaded. I lifted the cover off today to check heater and noticed two of these things they swim just off the surface and the water is really still. They kinda transparent makes me think of jelly fish.

 

[Crabs McJones]

Welcome to R2R!
They look like ghost flatworms

 

[sjarea88]

Is this a pest I should worry about?

 

[Crabs McJones]

Is this a pest I should worry about?

They're not bad, unless you like copepods.

 

[Dragon52]