algae or bacteria ?

[bobbet43]

i have a new setup. it's been running for almost 3 weeks now and last week a red algae or bacteria started to grow on the sand and rock. i was told by 1 person that it was algae and 1 said that it was a bacteria from stagnet water. what heck is it?

[mogurnda]

Is it slimy? Dark red slimy stuff is cyanobacteria, aka blue-green algae. Comes from too many nutrients, too little water movement. Hermits will eat it.