No you cannot put a frog with goldfish; goldfish belong with goldfish
Do not, no matter what put a goldfish and a betta together unless you want the goldfish to die!!!
It is important to remember to put things in a goldfish tank, even goldfish get bored. Some of my suggestions for tank decor are artificial plants and a "hidey hole" for your goldfish.
No, if you put a pretzel in a goldfish's bowl, it will kill it
Goldfish put anything they can fit in there mouths.
godfish can be any color-not just gold. yes u can put them together if they r the same breed (goldfish)
other goldfish and mabey som catfish
I really would not put the tadpoles in with the goldfish...the goldfish will most likely eat them all. It depends on the goldfish size, but eventually they will try to eat the tadpoles whether they suceed or not. :/
On the leaf
yes you can
yes
Yes. It should be fine. I have 2 regular goldfish living with a bubble eye goldfish and to fancy fantail goldfish, so I think it will be okay.