red spot on sand

[rygoodm6]

when i got up today i noticed there was a red spot on my sand...any idea what it could be??? when i got home tonight it had gotten bigger...any idea?? never seen it before

 

[scubadoo]

It could be cyano aka red slime.
Causes:
High nutrients from overfeeding, additives, overstocking or in tap water
Old lighting
Poor water quality
Not enough water movement
Analyze your system based on the above list..also a thread here in the faq's regarding red slime.

 

[rygoodm6]

amonia is less that .25 nitrite is .05 and nitrate is 5.0 doing a water change tomorrow...what could this red spot be....its not like and alge it just a spot...look kinda like the sand turnd red

 

[scubadoo]

Ammonia and nitrite should be zero unless your system is currently going through the initial cycle.