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i have a 4' long 20"deep 18" wide aquarium, have been running a 400 watt single ended MH with xm 10000k bulb about 16" off the water the reflector is just your run of the mill reflector. have been able to keep xenia, hammer coral, shrooms, zoos, etc., but having a hard time with sps have lost a lot of frags. too much light, not enough, or something else? water params test ideal. Have 2 koralia 4s on opposite sides as well as a maxi1200 with rotator and my return, i think i have flow covered as far as i can tell. your help is very much appreciated.
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