It has to make sense. Goldfish get big and require a lot of space. I used to keep several species of coldwater fish and the stocking level was always way lower than tropical. I never mixed other species with goldfish either after I once tried a weather loach but it was far too eratic. In my stocking tank, I would grow a single carp to 5 inches in a 30 gallon tank. After that it was into the pond. Well, when I say pond I mean several acres and about 20ft deep. Oh, and this was in Scotland and a private loch. I'm quite aware of the consequences of releasing non-native species in the States. That's just dangerous and plain stupid.
A tank doesn't have to be huge to be enjoyable either. Now I only have a single 20g and I stock a small tropical community. I'd also love to get a larger tank but I don't have room so I keep what is suitable for what I have. I'm still a novice when it comes to tropicals and plants but this forum has given me the ammo to create something I'm proud of, even at 20g. My best advice is to listen to advice.
A tank doesn't have to be huge to be enjoyable either. Now I only have a single 20g and I stock a small tropical community. I'd also love to get a larger tank but I don't have room so I keep what is suitable for what I have. I'm still a novice when it comes to tropicals and plants but this forum has given me the ammo to create something I'm proud of, even at 20g. My best advice is to listen to advice.