Sps Polyp Extension
- Thread starter Dilan Patel
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As long as your coral is growing with nice color and doesn't start to bleach, there is nothing to worry my friend. Having excellent PE when lights on is a bonus.
I know many people disagree but flow is the most important aspect of sps , even more than light. We spend all the money on lights and hardly look at flows whereas indirect random strong flow brings out the best PE along with nutrients .
In my 30 in x 30 in x 18 in tank, am running 2 gyre 130s , 2 Tunze 6055 , 1 Tunze 6040 and a seaswirl for constant moving return water along with 2 reefbrite leds and 2 x 250 watt halides.
Have stopped all carbon and GFO and nutrients are pretty high . Definitely fighting algae but I hardly care for them as the PE is have now is insane 24 hrs .
This is just daytime .. nighttime it's as if polyps will fall off
Regards,
Abhishek
I agree 100% about flow being the most important when it comes to sps. I think that perception is being accepted more and more as research comes out showing how important it is.
This is just one article but there are many more.
http://www.advancedaquarist.com/blo...oral-photosynthesis-by-stimulating-co2-uptake
Remember that flow on a stony reef can be feet per second!
I am also a huge fan of feeding all corals with appropriate sized food. Since reef chilli was talked about here is an article. If monti can feed on it acro should not have trouble as montis have tiny polyps.
https://www.academia.edu/1647139/Coral_farming_effects_of_light_water_motion_and_artificial_foods
PE differences vary from species to species. I used to have excellent PE on all SPS when my light was not that bright. Now they vary so much even thou they came from the same area and depth.
I am interested in this and wondering where you read this or where did you come up with this? I think everyones SPS has better PE when the lights are off compared to when they are on.
Yes, PE is way better at night as this is the time a lot of micro sizes critters came out. Corals senses food, extend their polyp out to feed. This is true even for NPS and LPS, but some photosynthesis coral doesn't bother at all (remain closed).
On intensely bright tank, some SPS will not display excellent PE, some might not show any at all. I have no idea why (not much PE possibly a form of protection or simply about maximising surface area for light catching function hence more PE or something else). I have read it in a few forums but that was several years ago and I can't recall the article. I believe several studies suggest 350 PAR and below is the best for SPS.
@codydemmel4 , this might answer some of our questions on PE
http://jeb.biologists.org/content/206/22/4041
" Crossland and Barnes (1977) claimed that polyp retraction in Acropora acuminata can be a way of avoiding light by self-shading. They showed that the light saturation level and the compensation point were 25% higher when polyps were contracted than when they were partially expanded. Similarly, when contracted, Xeniids completely stopped their oxygen evolution (Svoboda, 1978)."
http://jeb.biologists.org/content/206/22/4041
" Crossland and Barnes (1977) claimed that polyp retraction in Acropora acuminata can be a way of avoiding light by self-shading. They showed that the light saturation level and the compensation point were 25% higher when polyps were contracted than when they were partially expanded. Similarly, when contracted, Xeniids completely stopped their oxygen evolution (Svoboda, 1978)."
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