ID alage

[mohammadali]

this is the first time i see this kinda alage in my tank they have been growing in the back of my cube tank and the power head
http://i1053.photobucket.com/albums/s464/alexafg/P1040014.jpg

<a href="http://s1053.photobucket.com/albums/s464/alexafg/?action=view&amp;current=P1040014.jpg" target="_blank"><img src="http://i1053.photobucket.com/albums/s464/alexafg/P1040014.jpg" border="0" alt="Photobucket"></a>

[Madmak]

Looks like some red and green cyano to me. Some could be coralline as well. The white sponges are generally harmless and disappear over time.

IMO only, I'm no expert.

[SeaHorse_Fanatic]

Looks like red cyano and green hair algae to me. Hard to tell exactly from the pic though.