I think Capekate has you pretty well covered.
I can tell you from personal experience that my GBRs are quite comfortable with only plastic and silk plants. My tank is not heavily planted at all. I also have (2) fake hollow
driftwood logs that they seem to like swimming in and out of. They seem to like having an different places to enter and exit.
IIIHawkIII - Google Aquarium Adventure. They have a couple Illinois locations, an Ohio location, and a Long Island NY location. Myself and another local Chicagoan (wot-fan) have been able to pick up some really beauties there...both Male & Female (I've read a lot of people are having trouble finding Females)