You could definitely add a BN pleco or a school of cories. 1 angel fish may be OK for awhile but you may eventually need to move it to a bigger tank. I'm sure assuming you are keeping the tank pretty hot for the GBR so be careful what corys you put in the higher temps.
I agree that an angelfish should be in a larger tank. But bottom dwellers yes you can.
You could do a shoal of Kuhlie loaches or cories, and a dwarf pleco or even kribensis cichlid.
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