Your albino Oscar's fins should not be turning black under normal circumstances. They can be turning black due to conditions such as too much ammonia in the water. Get your water tested to make sure.
No not really. It sounds beautiful though.Their are longfin Oscars and are normally more expensive.
Its normal just rare. You can sometimes buy Long-finned Oscars from pet stores but its hard to find.
You might be able to get away with it, but honestly i don't think it's a very good idea. The Oscars are likely to nip the fins of the koi. Oscars are much more aggressive
pectoral fins
black
the dorsal fin is used so dolphins dont roll when turning
When feeding an Oscar is easy easy to tell if its had enough. The area right behind its anal fins will look bloated and round.
A black & orange fish.
Original answer - "i don't know but try this. put a dead fighting fish in a tank that has albino tiger barbs OR tiger barbs and see if the fish attack or eat the dead fish."I have an albino tiger barb, and through my research and experience I can almost guarantee that a fighting fish and an albino tiger barb will absolutely not do. Scientists don't know why tiger barbs have an unusual fin nipping behavior. I emphasize this especially if the fighting fish is the Siamese kind. Long fins+tiger barbs=bad choice. My albino even nipped the other albinos' fins, which proved fatal. Don't take your chances.Sources - "Aquarium and Pondfish", personal experience.
Usually it is rough so anything in there or by the inside can be broken up, I think.
Black is a good emitter of infra-red radiation than white or any other light colours, so it will allow the temperature of the cooling fins to fall quickly.
fishing nets and killing them for their fins