Which ATI LED Power Module for ELOS 120 XL

[kevindo123]

Dimensions: cm 120x80x50h (126Gal)

I want to keep mostly SPS.

ATI website has the following guidelines:

1. ATI2607 36" 2x75W LED & 8x39W T5 LED-Powermodule 120-180
2. ATI2609 48" 3x75W LED & 4x54W T5 LED-Powermodule 110-180
3. ATI2611 48" 3x75W LED & 8x54W T5 LED-Powermodule 160-260

I cannot decide what to get.

 

[jcdeng]

sps = #3

 

[M&M]

Definitely you want the 8 bulb model. Most people will tell you to get the 48 " long fixture, i agree if you want your rockwork and corals from wall to wall. I have the same tank as you and i am using the 36" ATI PM, i like how it looks over my tank, but most important was how i did my aquascape. Rock was build in the middle of tank, allowing for great flow and coral growth. I did not need to light up my tank all the way from side to side. Still with my fixture hanging about 18 " above, light spread was good not to notice too much, but PAR levels were lower on sides, but enough to grow any coral.( this fixture is a PAR monster). So...., decide how you want to place you rock and corals. Also, if you might upgrade for a bigger tank in future, going with bigger fixture makes sense.