umm it sort of depends they could fight each other or nothing could happen
Of course!
No, if you do that than the parent goldfish (and any other goldfish around) will eat all the eggs and any possible fry.
You should not have goldfish and platies in the same tank ever.
Usually it's because the male wants the breed with the female so he chases the female around the tank! So unless you want little fry (baby goldfish) in your tank you should separate them!
yes, but it may kill the goldfish
um, no, not at all.
no
Rule of thumb is to not mix tropical fish and goldfish.
No, Neon Tetras and Goldfish do not belong in the same tank. Goldfish prefer cold water, while Tetras are more of a tropical fish.
my fish also does that. Is your fish a male or female? If it is a female it is probably pregnant. Hope that helps!
Yes, but your tank size needs to support it. If you mean that a regular goldfish is a long single-tail goldfish, then you need at least a 40 gallon tank just for the 2 fish due to the size potential of the common goldfish. If you mean a regular goldfish as in a round bodied fantail, or perhaps a ryukin, then you need at least a 30 gallon tank for the 2 fish.
If your goldfish is female and full of eggs, she may release them in the tank. If there is no male in the tank with her, she may very well simply reabsorb the eggs without ever releasing them at all.