Need help with lighting

[Havier Salgado]

I have a 75g 48"+18"+21" I have a fluval marine And reef led lighting g as of now on my tank would like to know if I add the fluval aquasky would that be sufficient enough or should I get another marine AMD reef light

 

[ReeferReefer]

What models exactly do you have?

What kind of corals are you trying to keep?