We've got a 34gal red sea max and we ran it for two weeks with substrate and live rock before adding our CUC and frog spawn and torch corals. A week after that we added a perc... and so on. Don't know about adding water from your 90...
At this point 6 weeks later we've got: frog spawn, torch, zoos, leather polyp, another hitchhiker leather we haven't ID'd, one perc, one Lawnmower Blenny, one orchid dottyback, numerous hermit and snails and two cleaner shrimp. Everyone is fat and happy!
Don't know about the biocube lighting but the red sea lighting - according to their website - is good for all kinds... We've just got the softies right now.
I guess, I'm not that much help with the biocube questions... sorry.