does anyone know if this is a parasite thx

[phillytec]

i have these on the wall of my tank and I'm just wondering if i should be concerned.

thanks for the help.

 

[downbeach]

Looks like hydroids, see here:

http://www.lionfishlair.com/hitchhiker/hitchhiker.shtml

 

[M.phenax]

yep

 

[phillytec]

cool
thanks for the link
much appreciated.