good capture.
i was there on friday and saw 2 BCNH and one GBH. he BCNH were hiding close to the reeds and weren't within photographic range. one of the BCNH is VERY petite but doesn't look like a juvie.
these guys will be there for a while (until the GBH possibly kick them out).
but with the extra tall vegetation, i think it will be a great summer/fall to see herons at the brickworks. lots of places for them to hide and fish. lots of rewarding shots of them flying as well