how do i keep yellow

heller792

New member
I have an acro that was a lovely yellow when i bought it. It quickly turned into a kind of green and im just wondering how to make it yellow again. Its continued to grow very fast and has no problems other than changing colour.

Thanks, Dave
 
here is the coral now
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and when i added it
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Dave
 
My guess is it will probably go more green.

Sometimes you can keep the yellow by pounding it with light or going Ultra ULNS. Notice the 2 ultras.

My guess is naturally that coral is green. almost 100% of the time these acros that look yellow are just a little bleached from light shock or shipping. Once in a while/rarely the coral will actually be yellow.
 
Like dvanacker said it's all about super high par values and low nutrients. For instance I have a pink lemonade and it's quite yellow but to get the yellow I'm hitting it with about 800 par and I have fairly low nutrients also, less than 5 for nitrates and about .003 for phos.
 
like you said it must be that par is a must, my phos is 0 using d&d high sensitivity and no3 is also dead zero using many test kits and pinpoint meter. Its a shame really as i also have a yellow mili which has also turned green.

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Dave
 
^...+1

I bought a maricultured yellow piece at MACNA in Atlantic City 2 years ago. At the time I was running 10K 400 watt XM bulbs....par monsters. This coral could take it less than a foot away from directly under the bulb in Lumenmax Elite reflectors and was as bright as a ripe lemon. As I increased the photoperiod it exhibited orange tips. Everything else in the tank suffered from the intensity and duration.

When I made the switch to Radium bulbs on Galaxy ballasts everything else colored up, but the bright yellow seemed to have faded and tips are now more green. True yellow SPS corals can definitely handle high lighting, and probably need more intensity found in the full spectrum range that many of us shy away from because of the yellow tint to the aquarium. I remember when snorkeling in Fiji that one of the brightest yellow SPS corals I had ever seen was a mere 3 feet under water at low tide in very intense sunlight....not branching off of a reef wall but right on top of the rock structure getting the sun's full intensity all day long.
 
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