This is completely normal. Each fish will deal with the stress of changing water and environments in its own way. Relax and it will be fine soon.
It is not being aggressive it is just being a goldfish. Goldfish will eat any fish small enough to get into their mouths. They do not recognise their own fry(youngsters) so are quite likely to eat them given the chance.
no
If you like him and he seems to enjoy your company, why not? Some guys are just as nervous as women about initiating.
Goldfish are moderately inactive fish. They will spend much of their time just floating or sitting at the bottom.
he is nervous and is afraid you might have made fun of him for something just smile. He will get over it. he is prob nervous.
IF you mean literally a goldfish, no. Just no. Otherwise provide information on what you mean by a "goldfish".
The fantail goldfish is asserting it's dominance over the common goldfish. The fantail goldfish has already established in its mind that the whole tank is its territory and will fight any other fish that try to change that. This is normal when adding new fish to an established tank and they will usually continue to fight for a couple more days. During this time make sure to give the fish plenty of food to eat and some place for the common goldfish to hide. If they do not stop fighting after several days than I would recommend moving the common goldfish to its own separate tank of at least 20 gallons. Another reason (though not as likely) is that the common goldfish is a female and the fantail is a male. A male may chase a females rear- this is normal but if he harrasses her- remove her immediately.
All goldfish can, just like all mammals can.
Normally goldfish are peaceful and calm.But incase your goldfish is doing so then its better to separate the new goldfish.
Yes, they are. Just be sure to not overcrowd their tank.
goldfish don't really need treated water because goldfish are like feeder fish there is a 20% chance there going to live past a month but if you want to try it just go to petsmart and get betta water conditioner or leave regular tap water out for a couple days (2-3)
well it just depends how old it is