Angelfish are a schooling/shoaling species and should be kept in groups of no less than 5 if you with to avoid fighting and bullying problems in the growing young fish. 2 males will be OK until they reach breeding size and condition and then there could be fights as they try to mate up with females. I very much doubt if you can sex your angelfish anyway. It is extremely difficult. Particularly when two females will commonly get together and spawn.
yes they can but not all the time they could kill each other for the food that they do.
I dont get it. Did your angelfish die?
No...betta fish are usually aggressive and might kill the angelfish.
No the beta will try to kill it
That will likely cause very few problems.
that probably wouldn't be a good idea.. the Oscar will probably eat it.
Technically , both require different environments. Goldfish likes cold water and angelfish likes tropical. However, goldfish can survive in warm water so both can be kept, leaving one of them unhappy.
Angelfish are very aggressive fish. They are also very territorial. They want their own space and the whole tank if they can have it. I'd suggest that if you have a small 3 to 5 gallon tank you get a bigger tank as that size tank is too small for Angelfish.
Anything that's bigger than them. My angelfish is afraid of the light over the tank.
To maintain or gain leadership in an area, probably your tank.
Angelfish are clever fish, from my experiences if you put your finger up top of the tank they will follow it.
It is not harmful. But if you want to clean up the algae in the tank you want to get a pleco. They are very peaceful fish and will not harm angelfish. I have a pleco and three angelfish in my 35 gallon tank right now and they get along great!
If the tank is big enough. (40 gallons per dragon at the minimum)