New growth no color?

[JimBeam]

Hi,

I have a frag of a metallic green acro:



It started a few weeks ago under T5 and grew nice, most of the 'arm' you see grew in this time.
But as you see the new part is not green but white...
Any ideas on whats missing?
I've changed to LED's (Pacific Sun Metis) two weeks ago and kinda hoped it would improve a bit but it didn't (although it did grow a bit in this time).

I hope anyone have an idea on whats missing?
I change water every week (8%) use Prodibio and Zeo start-3 to keep phosphates low (and with success).

 

[Nano sapiens]

Hi,

I have a frag of a metallic green acro:



It started a few weeks ago under T5 and grew nice, most of the 'arm' you see grew in this time.
But as you see the new part is not green but white...
Any ideas on whats missing?
I've changed to LED's (Pacific Sun Metis) two weeks ago and kinda hoped it would improve a bit but it didn't (although it did grow a bit in this time).

I hope anyone have an idea on whats missing?
I change water every week (8%) use Prodibio and Zeo start-3 to keep phosphates low (and with success).

If there were no other changes, it's likely the change from T5 to LEDs.

May be a result of a change in light spectrum. T5 fixtures with multiple types of bulbs will generally provide a more 'full spectrum' of light. Most LED setups cover less of the spectrum and have high intensity peaks at relatively narrow wavelengths. The change can cause color shifts in certain corals and I can see some yellowing starting on the old growth, too. What type of LEDs are in your fixture (Blues, Cool whites, etc.)?

Often, a change in light intensity can cause bleaching type issues. LEDs are often more intense than they look to our eyes and corals can get 'light shocked'. Your issue may be due to a bleaching effect (zooanthellae are expelled/reduced) and or the coral's reduction or lack of GFP (green florescent protein) production.

 

[Allmost]

May be a result of a change in light spectrum. T5 fixtures with multiple types of bulbs will generally provide a more 'full spectrum' of light. Most LED setups cover less of the spectrum and have high intensity peaks at relatively narrow wavelengths. The change can cause color shifts in certain corals. What type of LEDs are in your fixture (Blues, Cool whites, etc.)?

have you seen the spectrum of T5 VS that of LED ?
check this post !
http://reefcentral.com/forums/showpost.php?p=20825761&postcount=131

first pic, Mitras against ATI T5.

its in fact the other way around !

and if lighting was the cause, the whole thing change color ? rather than just new growth ?

 

[Nano sapiens]

have you seen the spectrum of T5 VS that of LED ?
check this post !
http://reefcentral.com/forums/showpost.php?p=20825761&postcount=131

first pic, Mitras against ATI T5.

its in fact the other way around !

and if lighting was the cause, the whole thing change color ? rather than just new growth ?

As you may have noticed I said 'most' LED fixtures don't cover as broad a spectrum as a good T5 fixture with a wide array of high quality bulbs. I'm not familiar with the OPs LEDs, so that's why I was asking.

If you look carefully at the old growth it is showing signs of changing to the same color as the new. It's only been 2 weeks (per the OP) so the coral has retained much of its GFP on the old growth, but I suspect that it will ultimately end up all the same yellow color if nothing is changed.

Please propose your own theory to assist the OP if you think it's not the lighting.

 

[Allmost]

As you may have noticed I said 'most' LED fixtures don't cover as broad a spectrum as a good T5 fixture with a wide array of high quality bulbs. I'm not familiar with the OPs LEDs, so that's why I was asking.

If you look carefully at the old growth it is showing signs of changing to the same color as the new. It's only been 2 weeks (per the OP) so the coral has retained much of its GFP on the old growth, but I suspect that it will ultimately end up all the same yellow color if nothing is changed.

Please propose your own theory to assist the OP if you think it's not the lighting.

don't take it personal I am not saying anything bad or rude to you just a friendly discussion.

secondly, the truth is that LEDS [light emitting diodes] give out alot more spectrum than T5 they have a larger Bandwidth or Tail.

I go agree that new growth is not white, and rather yellowish, so could or could not be due to light, mainly wanted to "share" the info about spectrum of LED [just sharing though, not correcting you or anything ]

 

[Nano sapiens]

don't take it personal I am not saying anything bad or rude to you just a friendly discussion.

None taken. Just wanted to see if you have an alternate take on the OP's issue.

secondly, the truth is that LEDS [light emitting diodes] give out alot more spectrum than T5 they have a larger Bandwidth or Tail.

Most LED fixtures (especially older ones) use cool whites and blues (~450nm). This is not 'full spectrum' by any means. That's why T5s and LEDs together were/are so popular. Only recently, manufacturers have realized that they should be including near UV, violets, reds, etc. to create a greater spectrum of light and proper intensity in the specific wavelengths that the corals use for photosynthesis. Since most people have older LED setups, and even many new LED setups still do not cover more of a full spectrum of visible light since the LEDs such as Violet/near UV required are quite expensive, I think your statement that LEDs can cover a broader spectrum than T5s can be true, but only when using the best upper end LED systems. Sound right to you?

 

[JimBeam]

Most of the white growth was already under the T5, the LEDS been here only for 14 days so I doubt they have anything to do with it.

Ofcourse its possible both the old T5 and the new LEDS are missing the crucial part of the spectrum that makes the 'green'.
Does anyone else experienced the same or something simular?

 

[Nano sapiens]

Most of the white growth was already under the T5, the LEDS been here only for 14 days so I doubt they have anything to do with it.

Ofcourse its possible both the old T5 and the new LEDS are missing the crucial part of the spectrum that makes the 'green'.
Does anyone else experienced the same or something simular?

You are correct. My bad, I misread the OP's post thinking the new growth had gone white under the LEDs, but after re-reading the white growth was already there with the T5s.

 

[celamb89]

Check the settings on ur LED's maybe u have them too bright... LED's will put out a lot of par I had this happen to a blue tort, I lowered the settings and it came back no problem