Magenta / Burgundy colored algae over our live rock and sand

[shodoshi]

Hi folks,
In the last few days I have noticed algae has carpeted the live rock and sand in our tank 30 gallon Nano Cube. We were able to do a few water tests:
Ammonia: 0.25
Nitrate: 0.20-0.25
PH: 7.5 - 8
I ran out of chemicals to test the other needs in the water column until tomm.
Any ideas what might be happening?
Thanks,
Todd

 

[meowzer]

Welcome to swf.....we need more info than that.
how old is the tank? Do you have a picture? Any fish in it? what is the filtration you use? Any powerheads?
etc etc

 

[bang guy]

Does it come off easily? Sounds like Cyanobacter.

 

[shodoshi]

We have two power heads, the filter system is three stage: it has carbon, it has a sponge and the bio matter.
We have several fish. The tank was setup in September of last year.
Thoughts??
TIA

 

[bang guy]

Looks like Cyano as well. This is usually caused by a combination of insufficient waterflow and excess Phosphate. Siphoning it out helps but the cure is to discover where the phosphates are coming from and to increase waterflow.