If you have ever kept sps under T5 lighting advice needed
by, 04-21-2012 at 12:01 PM (1761 Views)
Well it's me again and again I am having questions about keeping millepora under my lighting. I have had these 4 millepora frags for over a month now and I figured I would slowly acclimate them starting from the bottom up to a higher location in the tank. I have all my brighter colored millepora just under halfway up the tank now but I have a more of a greenish colored one that I can't seem to get off the bottom of the tank. Everytime I moved it up even an inch all of it's polyps retract (I should note that none of them have good polyp extension at all) and the color gets lighter and fearing a bleach I quickly move it back to the bottom where it recovers in a matter of days. They are almost all showing growth and the one that stays at the bottom in the sand actually has the most growth of them all. I have an orange montipora cap high in the tank and loving it (then again nothing can kill that thing)
Currently I am running a 6 bulb T5 HO fixture on a 75 gallon but I have changed the lighting schedule on it with the assumption that my lights were frying the frags. All six bulbs are not on at the same time any more I run just 2 blue plus for about 3 hours and then those go off and I run the other 4 bulbs for about 5 hours and then everything goes off for the night I have only been running that schedule for a week. I have a Vortech MP40 running in short pulse right now for all my flow. I also am running Vertex bio pellets and refugium in a 35 gallon sump and a reef ocopus 150 skimmer.
All tank parameters as far as ammonia, nitrites, phosphates, and nitrates are zero. Dkh is currently 9 and I am slowly raising it, calcium is about 420, and magnesium about 1600 due to last months fight with bryopsis but this is a problem that has been going on before that.
I know I have been told to raise my lights up about 7" higher then they currently are before but my wife just isn't on board with that. So my question is am I on the right track running reduced light? How is it that I see sps dominated tanks with acros and milles up in the top part of the tank but I am having a hard time just keeping mine from getting fried in the lower half with these lights? any advice or answers would be greatly appreciated.