Currently have a standard 75g, but just bought a planet 120 (48x24x25). I have 2 xr15 g5 blues and figure with the 24“ depth I will need something to add for shadowing / more even par. Not sure a 3rd g5 really gains me anything. The question is what without breaking the bank. This is for a mixed reef. I will make my own mounting. I like the the power consumption of leds ( strips). There are a lot of options and do I need dimmable? I have looked at the t5 retro kit, thinking 1 bulb front and back? Any advice / pics of a lighting on your 120 would be great.