I would go with some LEDS.
Those there are MH
[ metal halide] and even if only 175 watts each will throw some heat as well as use more electricity then needed.Also similar to fluorescent tubes the MH
actually need regular replacing also...
Those bulbs could be as high as 400 watts each ! I have a 4' fixture with 2@250 MH
in it from years ago...They are best suited to marine uses IMO
I use LEDS but are old like me and surprisingly still not very cheap..Current True lumen PROS .I have no real issue with them ,but would not recommend them today for the price.
Look into Finnex or Beamsworks and do at least 2 untis that are 1/2 the tank length IMO