The top photo looks like you have bryopsis, it looks like little feathers and turn a dark/light green when allowed to grow. My lawnmower blenny and emerald crabs don't even touch this stuff. you can remove as much as possible then try kent tech-m to raise your magnesium. it's supposedly an impurity in the tech-m that kills it off. start dosing at 1ml per gallon each for 3 days then increase to 1.5ml per gallon until the algae goes away, usually more works well but be sure to monitor the levels. should take about a week or so. I battle this stuff every time I come back home from a trip. i've read somewhere in the forums that the brightwell stuff works the same and is much cheaper to dose but have not tried it just yet. i have bryopsis in small patches right now and i plan on using the brightwell magnesium for managing the bryopsis and maintaining magnesium levels. we'll see how that goes. df
