ok,,lets see here,,,the tank infront of the window is going to be your reef tank, the tank to the left,,is that staying or being removed? if so,,are you going to keep the 90 in its current location? or move it to the left? another option is to angle it in the corner, improved visibility to the rest of house.
draw the room out in different layouts. think rethink and then ponder. its easier to make changes on paper than trying to move a tank. another thing i find handy is a plastic toolbox for assorted reefing tools and test kits...makes storage and clean up easier.