I'm having a problem with SPS corals. i have a 90 gallon tank that has 2 150w MH with 4 T5HO. The lights sit 6 inches from the water. I added a few new SPS frags over a month ago. A green slimer, pink birdnest, and a superman. I started the birdsnest pretty high in the tank and it bleached. THe green slimer and the Superman I started really low in the tank and they've looked good. They don't really appear to be growing but they still look good. A few days a go I tried moving the green slimer up a bit because I thought they liked more light. I can tell it's starting to bleach a bit. Whenever I try moving any of the SPS above halfway of my tank they begin to bleach. I don't understand, when i was making my lighting decision, people on here told me they thought I should've gone with two 300 watt MH instead of the 150's but here I am bleaching corals with the 150's. My levels appear to be good. I also forgot to mention I do have a SWC 160 skimmer as well as a 30 g sump with chaeto in it. Are my lights too close or is there another problem? Please help.
SPS & MH Lighting
- Thread starter JW3571
- Start date
karsseboom
New member
Corals will adapt to most of any lighting, you just have to do so very slow. People have 10k 400 mh with nice reflectors and there sps are at the top of the rocks with no problems at all they just take things very slow. Whenever you buy new frags it always a good idea to place them at the bottom even if they had better lighting before, then move them up slow like and inch a week.
mike_cmu04
New member
You are probably just moving them up too fast do it slowly or try moving your lights up a little.
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