For me almost (well all to be honest) cichlids are a no go, I have had red jewels before, pretty to look at but never again aggro lightly blighters, my sister had convicts once that promptly bred and then proceded to attack every other tank inhbitant. Plus my sister also had oscars once, nice enough fish, intelligent and fun to hand feed but no good for mixing with other fish, and I don't appreciate a fish that will take a chomp out of me just for doing some maintenace in their tank. I have also kept angels before but never again they just don't do anything for me.
I wont have a Barramundi, they just get too big and really need dams rather than tanks same with Murray Cod and Sleepy Cod. I guess I should add any tank buster fish here including common Pleco's simply because they get too big for the standard tank.
Never again will I have Chinese Algea Eaters, nasty little critters and much nicer other fish friendly cleaner fish to be had.
Wont have most tetras to prone to developing white spot as quickly as a preschool kid will catch a cold, and then dropping dead for no apparent reason.
Probably wont have fancy goldfish although I have some lovely hardy Comets in my pond.
Forgot a couple I wont have any sharks, silver, red tailed or any other type. Also wont have barbs ever again, they are pretty but too nippy. And even though I quite like pearl danios I probably wont have them again either.
Can't get dyed fish I Australia so thats a good thing to miss out on I think.
I love my Cory's and my loaches, as well as my and shrimp so the fish I keep need to get along with these guys. I also love my Siamese fighters, even if they can be a pain with getting correctly sexed females. And even though they breed like rabbits I am quite fond of my husbands guppies, we have good hardy stock with good colour that is saught after by one of my local pet shops, so we are lucky in being able to sell the offspring relatively easily.
And last but not least I wont have a piranha, simply because they aren't allowed into the country along with around a hundred types of shrimp. If Piranhas where allowed in I still wouldn't have them to shy, but if I could have the shrimp I would have them in a shot.