Well there ya go..... You've got ten different potential causes..... Hopefully that clarifies things for ya..... Aren't you glad you asked for advice:mrgreen::lol:

You just summed up the sps experience lol.

... and we still haven't scratched the surface on the variables associated with SPS, ha ha!

I might have missed it but has anyone addressed the fact that he's trying to grow light demanding coral under 150 watt bulbs? I wouldn't even attempt it. I know it has nothing to do with RTN but that's not much light for SPS.

I did see that but 150w even over my little solana started to not cut it. Can't imagine over a 180 unless they were those super bright iwasakis.

150watt HQIs are enought light, to low of light would tend to show up as browning and slow growth unless you go extreamly low light. people used to grow nice SPS under PC's and VHO's for some of you younger guys you might have to look thoes up :mrgreen:

Steve

Depends on which 150HQI bulb is being used. My sps sucked under a bluer 150. Seemed ok under a cheapie 10k but not great. Now under led, growing like crazy with tons of colour.

However I agree with Steve. Not enough light would show up as he said, at least in my experience. My opinion on rtn, is just looking at them the wrong way causes it. Of course thats ridiculous but its how it seems.

Thanks for the input guys, im going to try to lower DKH. I know that the light is low for SPS but I was suppose to have the LEDs up by now but have run into a few life issues every time im about to build them, but soon they will be up over this tank and my SPS should grow faster hopefully and love the color.