Why can't Goldfishes be put with Tropical fishes?
I currently have 3 goldfish in a 10 gallon. 1 as a comet goldfish, its very beautiful, with long fins. I've had it for over 3 years and its still only 3 or 4 inches. The other 2 are common goldfish I think, 1 is about 3 inches, and 1 is about 2 inches. Other than that, they are very healthy and happy. I've had them for over 3 years now.
I'm going to get a 50 gallon long aquarium soon. I've decided on a planted tank.
Fishes will be : 10 Harlequin rasboras, 8 cardinal tetras, 1 britlenose pleco, and 3 oto catfish.
I'm thinking of putting my 3 goldfishes in the tank too. Since I think their growth has been stunted, they probably wont grow much anymore and stay at around 4 or 5 inches. Since they are so small, I don't see a risk that they will eat any of the tropical fishes, since their mouth is so small too. And actually I've had these with neon tetras before and it was fine.
Also, about the coldwater thing. I think they've adapted to warm water too because I've had them for over 3 years in a 10 gallon thats around 20- 25 degrees celsius and they are still healthy, maybe not very happy, but still healthy.
So if they really have adapted to the warm water and their growth really have stunted, will it be alright to add them to the 50 gallon? because now I don't see any problems.