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Hi I have a 46 gallon saltwater tank that has been running for about 4 months. I have succesfully been able to keep a yellow tang, clown fish, and damsel alive for all that time. I have one concern. My tank is covered in black, and purple algea. Is this bad? I just cvers the rocks and pebbles on the bottom. I do have some green algea that is starting to cover the back wall and some of the ground. I do like algea in my tank and don't want to remove it if it is not harmful. I was told all different stories. I was told that the purple algea is the best and I've been told it's the worst and to get rid of it. Before I enter into more sensitive fish I would really like to clear up my confusion.
I'm not sure about the Black, could be Cynobacteria, do a search on "Red Slime" for that.
Purple is usually Coralin algea, it's a calcious algea that generally considered to be "pretty" and/or a "good" algea to have. It will cover your rocks and your glass/acrylic...
To scrape it off of viewing area's you'll need a scraper blade, Kent makes one with interchangable blades, red plastic blade for acrylic tanks and yellow w/ metal blade for glass tanks.It's not the size of the dog in the fight... It's the size of the fight in the dog! -unknown