Hey bud,
I do have a salt-water fish tank but its got more tropical species in it and those typically not recreational fish, aswell as corals.
Actually you are allowed to keep these types of fish in a fish tank for your own usage, as i emailed fisheries about this months ago and they said that for personal use, the capture of fish is permitted. However im not sure about whether the legal lengths are applicable, but im pretty sure they would be.
To keep bream and flathead you would need a very large tank with vigorous filtration to keep them alive, as they get very large, produce lots and lots of waste and are normally always swimming, moving and looking for food.
Good Luck with it all!!
The Guru