I have this crap all over my tank, no Ammonia nor nitrites detectible since cycle finished some 4 weeks ago. just rechecked my test kit, and it does pick up dosed ammonia in test batch of water. undosed fresh salt mix(RODI) and tank water have identical colour from start trough 5 minute read mark until 30 minutes later.BRYOPSIS:
IDENTIFICATION:
Green or blue tuffs attached to the rock work or glass and it it has a firm anchor to the rock work, as it grows it rises up and branches out.
WHAT IT FEEDS OFF OF:
This algae's food source is primarily Ammonia and Nitrite. If you levels of these two nutrients in your system you might have a bigger problem then the algae it self. Either you do not have adequate bio-filtration or you are way over feeding, or something has died in the system and has yet to be found.
HOW TO CONTROL IT:
The easiest ways to control this type of algae goes back to the basic fundamentals of reef keeping Strong established bio-filtration, Aggressive skimming, and a good husbandry schedule.
REMOVAL:
The easiest way to remove this algae from the system is to simply reach in and pull the tuffs out by hand.
NATURAL HERBIVORES:
This algae is not desired by a lot of herbivores but still yet there are a few that can be used for control and they are as follows.
Rabbit fish,Tuxedo urchin, Mithrax crab, and some sea slugs ( elysia spp,) *Sea slugs should be handled by experienced aquarist*.
Pick by hand, nice try, stuff is so slippery and well anchored that after 5 minutes of plucking there is barely any change.
I'm tempted to take all rocks out and give them 200bar pressure wash, give livestock back to LFS and nuke the tank with ...dunno...potasssium permanganate, H2O2(if only HTP wasn't outlawed in UK).