- Location
- garfield, nj
hello i am about to start a 155 bow tank as a reef i am having trouble with the lighting . i am planning on getting 2 175 watt metal halide pendants with 20k bulbs on the sides with a 250 watt pendant 20k in the middle. as you all know the 20k bulb is very bluish in color. is it necessary for me to get actinic bulbs like a t5 retrofit kit ?? since corals need the blue light to feed on would the 20k bulb be good for them. just need to clear my head and would like to know from some reef experts thanks MR.



