What Is This Growing ?

[N3il.h]

Hi all

Can you tell me what this is! Iv only been getting it from when iv bought moss. Its black in colour and it looks like the veins of a leaf....

Thanks neil

 

[DrRob]

It's a filamentous algae. Probably a form of staghorn. It likes the low flow that the moss creates. Might settle a bit if you turned the spray bar to spray onto it.
 
Might also settle when that duckweed covers the top of the tank and exports lots of nutrients and reduces the light levels.

 

[PrairieSunflower]

I like your bogwood. I have a very similar one too... similar to the bottom side without the branch bits coming up.

 

[MoneyMitch]

definitely staghorn - removing it by hand is good way to reduce it. what kind of lighting are you using? how much direct/indirect sunlight is the tank getting a day? how long is your photo are you dosing the tank with anything?
 
a TRUE Siamese algae eater will eat this type of algae. but its best to treat the cause rather then the problem =)