Is this coralline algae or cyano emerging?
Upgraded my salt water tank from my 40g to 75g three weeks ago. I already have some coralline algae but no it looks like I have a darker version growing and I just want to identify it early so I know what to do. I had a small diatom bloom after the upgrade but nothing crazy, and now this is showing up...I took a photo of two of the only non-live rocks in my tank so you can see it better. It blends real well with the coralline I have on my live rock but it's a little darker.
Only things that have changed are that I recently have been feeding my new Copperband Butterfly mussels, green shell mussels from New Zeland in a box from the local sea market, but I only leave it in for half an hour and been doing this for 3 days now. Could this add nutrients into the water to cause this? Also, I moved my heater from inside the aquarium inside my wet/dry sump, and my temp has been increasing. I came home and it was 79...most my fish according to liveaquaria.com want 73-78. Other then that nothing out of the normal...I keep my lights on 8 hours a day.
Any suggestions would be great. Thanks!
75g FOWLR Tank, Black Percula Clown , Pajama Cardinal, Orange Stripe Prawn Goby, Pygmy Angelfish, Copperband Butterfly
75g Freshwater Tank, 5 Silver Dollars, 3 Angelfish, Bristlenose Pleco, 5 Julli Cats