Strange Film and/or slime

[dgraves]

I have a strange film/slime that is developing in my saltwater aquarium. I will grow on the glass as a film (dark blue/green). I usually take a razor blade to scrape it off and it comes off in a long strip. I did this yesterday. Today there is a bunch leftover on the sand. See pictures. I don't know what it is, but want to get rid of it. I just bought new bulbs yesterday thinking it was from bad lighting.

 

[crister13]

Cyanobacteria. It's caused by excess nutrients.

 

[BelleMorte]

I thought cyno was red not blueish green

 

[dgraves]

I've tested all params, check out fine (Nitrite, Nitrate, Ammonia etc.).

 

[Fishfighter]

Chem-clean will kill it off. Read directions, pretty simple but that's just a bandaid for what's causing it. You need more flow or maybe overfeeding?