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I have a 12G nano tank that I fitted with 12 Cree LEDs (6 white and 6 royal blue) with no other lighting, and I always wanted to put a small RBTA in the nano tank. Even though the LED lights look great to people's eyes, I don't think my corals like them very much. Most SPSs I put in there will look great for a couple of weeks and grow well, only to turn brown and very slowly die after that. 8 months past since I first set up the LEDs, and soft corals and a couple LPS finally started growing better, and my green slimer is faithful in keeping its bright green color and actually growing. So I figure it is ready to add my long awaited RBTA. Thanks to Jason (Eight), he gave me a beautiful RBTA of perfect size (not too big, not too small). I put it in at the end of lighting schedule, and it immediately move to a shaded place. Next morning (the light is off until afternoon) it came out with beautiful bubbles and looks very happy. When I came back from work (6 hours after lights turn on), it took me a long time to find it at the bottom of a rock totally deflated. It melt away completely in a couple of days 
. That was very discouraging. After a couple of month, I finally got the courage to try it again. About a week ago, Matt (Reefready) dropped off a nice small RBTA, and I put it at a corner of the tank with mostly shade knowing it might not like it, again at the end of light schedule. It again looked nice and happy. Next morning it still looked happy. But after coming back from work, it is gone, again 6 hours after lights turned on.
I am thinking I might screw it up if it happened once, but twice in exactly the same way, could it be the LED lights? Does anyone else keep RBTA under PURE LED lights? If yes, care to share your experience?
How many Watts you running withthose 12 less
I'm playing with 4white 7 blue.... that's 33 Watts n that's on a 14gallon cube
Its seems a Tad strong I've seen three 14g cube ranging from 24-28watts thriving. Well
How many Watts you running withthose 12 less
I'm playing with 4white 7 blue.... that's 33 Watts n that's on a 14gallon cube
Its seems a Tad strong I've seen three 14g cube ranging from 24-28watts thriving. Well
They are 3w each LEDs, capable of using 36w max. I am using the dimmable driver, and turned it way down from day one, and it is only drawing 25 watts (measured by kill a watt). Given these drivers are not 100% efficient, I assume LED actually get about 20-22 watts of energy.
Tony, I have plenty of caves/shaded areas in the tank, and the RBTAs move pretty fast. I got some low light zoas/LPSs in the tank, and they did not get fried. I am suspecting it is the spectrum instead of light intensity.
just one more question what size angle lenses are you using??
I am not using any lens since this is on top of 12G Nano. You only need lens when you are trying to penetrate much deeper water. I actually fitted LEDs on 5 different tanks (besides this one and a pure white fuge light, all others are royal blue actinic) with total of ~75 Cree LEDs, and I am not using any lens on any tank except the fuge tank even though I bought a bunch. I found there is no need for lens for actinic (they seem to penetrate well even for my 24" 120G tank), and lens only add trouble (make the beams spotty, and easily falls off when accidentally bumped). Note Cree LEDs has a built in wide angle lens (I forgot the degrees).
In the following link there's a lot of information on LEDs. One of the things they talk about it the acclimation period of the light for the animals. They ramp up over weeks to months before full power. Check it out. There are also some great pics of tanks with LEDs only.
http://www.manhattanreefs.com/forum/equipment/70719-leds-good-bad-just-another-addiction.html
-Gregory
Hmmm this is making me rethink putting my LED creation over my anemone tank... or my SPS for that matter!
Maybe should test it out over a connected grow out tank or something first 
-Mike 
Hey Tong.
We share the same frustration.
I place any acro in my tank and they turn brown
LPS, chalices and zoas look great though.
I do have a RBTA that is very nice looking and grew from a 1" to something like 4 or 5" in a matter of 3 months with no feeding.
When I got it from a BAR member, it was such a cute tiny fella. I wish it kept the size, but it grew so much so fast... lol
I have one monti that was fluorescent before and have no fluorescense now.
My tank is 100% Cree LEDs. Biocube 29 with 24 LEDs.
I recently found out that I have red bugs, so that might have affected the coloration of acros, so I'm planning on treating it with interceptor and after that I'm going to place 1 small acro to watch results.
I'm running my LEDs from 3 to 9pm, but it ramps up and down. At the peak, it runs at 50% cool white and 75% actinic. I've experimented with all sorts of different settings with no really good result. Maybe I'm just too impatient and change it too frequently.
Roberto
Fremont, CA
Illuminata 57
When did you get the RBTA from Jason? he lost most of his, I wonder if the problem came with yours as well?
I think we underestimate the amount of PUR coming out of LEDs and end up toasting corals.
-Tony
"-Gresham
"Are you out of your mind Tony, you know better than to mix Blood Sport and reefing."-Tuberider
"I need a Vanilla Ice to English translator