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#11
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Also I'm still confused how your corals have been bleaching and have shown tissue loss for 2 years yet you still have them?? It also sounds like you've changed lighting many times which can also add to the problem you're observing. I should also note that bleaching refers to the loss of color in a coral which is caused by death or loss of pigmentation of the zooxanthellae. Bleaching does not directly refer to tissue loss. Different lighting spectrums produce different results for coral coloration, sometimes giving the effect of bleaching. I've dealt with many people who experienced this, usually right after buying a new coral from a tank with different lighting. This is the only reason I mentioned it before. Last edited by sphelps; 08-08-2009 at 05:33 PM. |
#12
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![]() hey, ive just started getting into corals, i have just purchased a zoo, and a kenyan tree (soft coral). now i have 8. 36w t5s in my 75 gal. is this too much light for my new corals? my lights are sitting about 6" off of the water is that fine or should i be lifting them? i have noticed that the coral almost lies down in the subtrate when the lights go off at night. is this normal? anyways any help with my new corals would be THE WORLD, thanks
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#13
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![]() Nothing is really to bright. Just proper acclimatization is needed.
All this to bright for certain corals now. Bah. In the mid to late ,90s I grew tons of various soft corals and lps corals under my 250w 65K Iwasaki. Not much brighter than those. Just manage depth and/or lighting periods when changing bulbs or adding new corals, until they are use to the lights. The eggcrate with some window screen also works well for acclimatizing. You can keep corals that require less light down on or near the bottom, with proper lighting, instead of trying to get everything up into the light.
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Doug |
#14
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They have never shown any tissue loss, I didn't say anything about that. If a coral shows the beginning signs of bleaching I will do what I need to do to stop it. By no means have any of my corals been bleached for 2 years!! The worst of the bunch for bleaching is my open brain, it always had to be on the sand and off to the side of the 16" deep T5 tank where there was the least amount of light. Because that coral is quite nice looking I would try to slowly inch it out into the brighter light (I mean move it like 1" sideways every couple weeks or month, and it would start to bleach. When I changed out the 2x39w T5 fixture for the 2x250w halide w/ 2x39w T5 which was 8" off the water surface making the open brain about 24" from the lights the color actually improved. In fact, all the corals' colors improved. Now the open brain is directly under one of the 250w DE halides on the sand in the 24" deep tank, which is about 27" from the halides and T5s. It continues to look better and better every week. So, I'm wondering what the simple answer to the bleaching is. Is it PAR? That doesn't make sense. Is it spectrum? Maybe. It is the T5s being too close? Maybe. I dunno, that's why I'm asking if anyone else has had similar issues. Quote:
The reaction is obviously not just a result of PAR, or at least not directly or singly. I'm leaning more towards spectrum, that maybe having a more complete color spectrum from the halides allows a much greater intensity to be used. That by using a bit of a broken spectrum using T5s (that's too harsh of a descriptor, but gets the point) makes the intensity of the T5 lighting seem greater to the corals. Just speculating here... I'm wondering what the results would be if you placed coral frags in one tank where one side is lit by T5s, and the other lit by halide where the micromols of PAR were the same on each side, and the Kelvin rating was the same on each side what the effects would be. Try to limit the variables simply just to the "quality" of the spectrum. Maybe there would be little difference, maybe there would be significant differences. I wish I had the time, equipment, and money to try this out. I know there was a similar experiment to the one I just described, but I do believe it just compared T5s of one brand to another if I remember correctly it may have been AquaScience VS Giesemann or AquaScience vs KZ. Anyone remember that?? Quote:
Last edited by Myka; 08-09-2009 at 04:07 PM. |
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![]() It was ATI vs. AquaScience. I have the link at the office. I'll post it tomorrow.
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#16
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