Hello again i...
Trust me on this one. I've kept and am keeping tropical fish and Goldfish. There are numerous reasons for not keeping Tropicals and Goldfish together. They have different food requirements, water temperature requirements, Goldfish will stress in warmer water, that Tropicals prefer and visa versa. Warmer water doesn't hold enough oxygen for a cold water fish like a Goldfish. Colder water maintains a higher oxygen level that Goldfish prefer. The eventual size difference alone should tell you not to combine these two.
Research keeping Tropicals with Goldfish. This is an accident waiting to happen.
B