yes mine got along fine
You should get some sucker fish and they will eat it instead of the fantails (but beware they are really hard to catch if you have a new tank that what you first put them in)
No the koi and the red fantails tails have a difference with the tails, the red fantail is bubbly and the koi is straight so the koi will get more food and will pick on your other red fantails
if female beta fish are put together they would start to fight like the males.
All fish, with the right conditions. You do, however, have to be careful about what fish you put together in aquariums.
yes, do not put them together
I don't think any should, i had a fantail once in its separate tank and i put it in a tank with like 10 other little fish when i was cleaning its tank, when i went to go put it back it had eaten all the other fish! It like doubled in size...and so i lost all my fish that day cuz after and hour of floating on its back the fantail died.
see: Why_serve_lemon_with_fish
The turtles will eat the fish.
No becaUSE THE MALE BETA FISH WILL FIGHT TO DEATH.
Beta fish don't get along with other fishes, they will attack any fish that they see as a threat. If you buy a female and a male beta DO NOT put them together.
Not every fish is okay, maybe check with a fish expert at a local pet store and see. But, whatever you do, don't put two Siamese Fighting Fish together. They WILL fight!
She will have a tummy that is rounded as if a tiny ball is inside her. If you keep an eye on them when you put them together you will soon see if she is interested and ready by her behaviour.