Fully grown Angelfish could be OK with Oscars but I would never try it. I like my fish too much to risk them being damaged by my stupidity.
No. Oscars do not belong in with Angelfish they are far too boisterous. If you say what kind of fish you are calling a "Shark" (It certainly will not be a shark) I can advise on that too.
No because angelfish needs oxygen filtered so only an aquarium can be used to own an angelfish.
Angelfish are clever fish, from my experiences if you put your finger up top of the tank they will follow it.
Angelfish will likely pick and nip at fighting fish if put in the same aquarium.
No...betta fish are usually aggressive and might kill the angelfish.
keyhole cichlids
You probably scared it
depends on what type of dwarf angelfish some require more territory than others
yes otherwise they will eat eachother
No it is not, as you can see, the queen angelfish is much more colourful. The angelfish is just black and white. Except for the male, it is colourful but not as colourful as the queen angelfish.
"I had a beta and an angelfish at the same time they got along just fine. nope, sorry I had a beta and it killed my angelfish...good luck though" It mostly depends on the bettas personality. You can put them together but watch them closely, If they start fighting separate them.
There are not many fish that are compatible with Angelfish. Only Angelfish are truly compatible with Angelfish.
That will likely cause very few problems.