Big Green Moon
Big Green Moon
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Green hair algae?
PLEASE READ FULLY BEFORE ANSWERING THE QUESTION AS WHAT YOU MAY SUGGEST I MAY ALREADY HAVE MANY THANKS FOR ALL ANSWERS THEY ARE ALL VALUED THANK YOU 
In my 48"x12"x18" MARINE tank I have 10kg of live rock (needs more I know, maybe the same amount of ocean rock (in size not weight) Then I have 8 blue leg hermits, 10 green leg hermits, 10 Turban snails, a sand sifter starfish, a sea hare then I have 1 fox face, 1 regal tang, 2 clowns, and 2 green cromis.
I am running a big canister filter with 250ml of purigen and 100ml of phosgaurd.
The usual ceramic pots and sponges. I have a powerful UV and 2 powerheads 700lph each, I do water changes every 2weeks, Only feed my fish every 4 to 5 days,
I have 2 dayglow florescent tubes that run for 7hrs per day and a moon glow tube that runs for 8 hrs per day, All my bulbs are new my tank is 18months old and all my parameters are spot on also my phosphates are at zero. BUT I am being over run with green hair algae AND NEED HELP DESPERATELY
Green hair can over run a tank, and it may be because of a combination of three causes. You may also have spores present that continually reproduce the algae. Unfortunately, most aquaria have these spores in them, either in the water column or on the rockwork. Granted, there are cases where these spores would not be present, say with the use of a UV sterilizer and micro-filtered seawater or synthetic seawater.
Don't be surprised if your tank has a green hair algae problem and your phosphate levels test out somewhere around 3 or 4ppm. Green hair algae can grow and thrive in the presence of <1ppm! So, we need to endeavor to keep phosphate levels below 1ppm, or better still, below 0.5ppm.
Green hair algae thrive on more-red spectrum lighting, which is why it is so often a problem when our lights get old, and red shift. As lights age, they tend to shift toward the red-end of the spectrum. This means that the older the bulbs get, the more red-spectrum light they are emitting, which is hard to notice because it is such a gradual change, but the algae knows! Often times, algal overrun coincides with the last stages of a light bulb's life.
Pull out phosphate, you already seem to be doing that...hhmm.
Green hair algae use Molybdenum (MoO4) as a food source. Molybdenum commonly enters your tank in trace element additions and water changes. Molybdenum is essential to beneficial organisms such as zooxanthellae, as well as nuisance algae such as green hair and Cyanobacteria. However, molybdenum in concert with high phosphate levels and ample lighting can cause an explosion in the density of green hair algae.
Do not overfeed. You already have crabs for clean up so that should help. Replace old lights. If you can, do not run your lights at all. This means, if you have no corals, macro-algae or other organisms that will suffer from this. Alternatively, you can run only Actinic bulbs. If you don't already have them, you might consider replacing your lights with pure Actinic bulbs. The blue-spectrum light will provide the necessary light to your desirable organisms and reduce/eliminate red-spectrum light used by the nuisance algae. Or you can reduce the photoperiod by 2/3.
Hand prune the algae. Either pluck it or use a toothbrush to scrape it and remove it. This is critical. Algae, when killed, releases PO4 into the system, so you can create a self-perpetuating cycle if you just scrape the stuff off and leave it floating in the tank. You can also scrub rocks.
Finally, encourage the growth of coralline algae by maintaining proper levels of calcium and alkalinity. Although green hair algae are ectophytic, it will generally not grow on coralline algae for some reason.