Bpb
New member
https://www.bulkreefsupply.com/vide...light-water-motion-by-dana-riddle-macna-2016/
The video in question linked above.
I watched this last night and it was really eye opening in a lot of ways. It confirmed some of my own observations regarding flow and alkalinity levels. It also revealed some science behind alkalinity that I didn't know. Corals using alkalinity not only for skeleton building, but also for the production of simple sugars from respiration was very interesting.
What blew me away the most was his discussion of lighting. Watch the video for the technical details, but from what I gather, his test specimens reached light saturation and photoinhibition MUCH lower than expected. Between 100-250 micromols of par. This is substantially lower than is typically recommended for an sps tank and most acropora.
Granted. He did his experiments on porites which most of us don't keep. But...my big question is this: he is determining saturation and photoinhibition in chlorophyll found in porites. Is that applicable across the board? Are the zooxanthellae and chloroplasts found in an acropora spathulata different from that found in porites? Or a lobophyllia for that matter? Is photoinhibition the same from coral to coral, but some with thicker or thinner tissues able to tolerate it and repair better from it?
I suppose I thought I understood light requirements but this video made it even more confusing. I understand higher light levels lead to more pigment productions which I understand help fight off the free radical byproducts of photosynthesis, but slow down photosynthesis at the same time. But would reducing our light levels in our acropora tanks to 100-200 par across the board "turbo charge" growth (even if it's at the sacrifice of color)?
Early in the video he also mentions fluorescence as inhibiting photosynthesis? Or am I not understanding that properly. If so then he would be suggesting a warmer spectrum to be much more growth promoting due to less fluorescence, despite all those blue wavelengths being important absorption peaks for photosynthesis.
Ideas?
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The video in question linked above.
I watched this last night and it was really eye opening in a lot of ways. It confirmed some of my own observations regarding flow and alkalinity levels. It also revealed some science behind alkalinity that I didn't know. Corals using alkalinity not only for skeleton building, but also for the production of simple sugars from respiration was very interesting.
What blew me away the most was his discussion of lighting. Watch the video for the technical details, but from what I gather, his test specimens reached light saturation and photoinhibition MUCH lower than expected. Between 100-250 micromols of par. This is substantially lower than is typically recommended for an sps tank and most acropora.
Granted. He did his experiments on porites which most of us don't keep. But...my big question is this: he is determining saturation and photoinhibition in chlorophyll found in porites. Is that applicable across the board? Are the zooxanthellae and chloroplasts found in an acropora spathulata different from that found in porites? Or a lobophyllia for that matter? Is photoinhibition the same from coral to coral, but some with thicker or thinner tissues able to tolerate it and repair better from it?
I suppose I thought I understood light requirements but this video made it even more confusing. I understand higher light levels lead to more pigment productions which I understand help fight off the free radical byproducts of photosynthesis, but slow down photosynthesis at the same time. But would reducing our light levels in our acropora tanks to 100-200 par across the board "turbo charge" growth (even if it's at the sacrifice of color)?
Early in the video he also mentions fluorescence as inhibiting photosynthesis? Or am I not understanding that properly. If so then he would be suggesting a warmer spectrum to be much more growth promoting due to less fluorescence, despite all those blue wavelengths being important absorption peaks for photosynthesis.
Ideas?
Sent from my iPhone using Tapatalk
, when I purchased my LED light bar I just went to my lfs, and after a quick review of the livestock in my tank, and my budget for lighting for my tank, I purchased what they recommend. Previously to this, I just thought about lighting from a photographer's viewpoint. For example, I was at a country music concert a week ago, and was having a devil of a time getting any decent shots of the artists, until I realized the lighting temperatures on stage was way hotter than the white balance setting on my phone in automatic camera mode on my phone. Once it was reset, the difference was huge.
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