I have a Nuvo black 30g that I am going to be adding toy system (36x15 footprint) I know I want radions but can't decide on two gen4 xr15 or one gen4 xr30. Attached is my par readings with a single gen4 xr30 that I borrowed. Unfortunately I am unable to get numbers for the two xr15s. I imagine the xr15s will give me a more even spread of par across the tank but the single 30 doesn't seem too horrible. The tank is going to be for nems and softies/lps/euphilia(spelling?).





