I have a number of ponds and very many cane toads. My current strategy is to go out regularly of an evening and collect all the toads. It's very difficult to keep them out unless you fence off the area. They do have very limited climbing abilities. But 30 to 40 cms wouldn't be enough to keep them out. To breed the toads like shallow water so if your pond has straight sides down into deep water it should solve that problem. It won't stop them falling in though and they won't be able to get out

Don't know where you are in NQ but don't know whether you'll be able to keep Goldfish successfully there. People here who are obsessed with keeping Goldfish in aquariums get water chillers to keep the water temperature down to a more suitable level. There's a lot of other fish species that you could get. None that I know that will eat toad eggs or tadpoles though.

Hi

Have a similar problem in my corner of the world My main pond is around 18 inches above ground has stopped turtles but not the toads .lol I do what tropic suggested ,gathering then up and scooping out the eggs .Also have found nothing that will eat them even snakes avoid them

As to fish I keep goldfish and native type called a red horse minnow and have kept tropical fish in the past . Depend on the winter lows many types will survive down into the 40's f The goldfish will take the heat , the main problem with them is breeding. They overpopulate rapidly !! Second is water birds .they will catch the fancy slow moving goldfish easily but with a lot of vegetation the single tailed faster types can make it and then overpopulate lol

As to the toads there doesn't seem to be a solution they are decimating most of the native frogs and toads . They wiped out my population of southern leopard frogs though I still see them in larger lakes and the canals

Good luck gary

You can try coffee grounds. My vet told me to create a barrier with it. We have bufu toads and needs to keep them away from my dog