The Oscar fish naturally stay calm when they are in a pair.keeping more than two Oscars in the same fish tank can cause then to get aggressiveso keep two Oscars at the max in one tank.
If the tank is large enough. For rearing young Oscars a 50 gallon tank is about right for 5 fish.
I would advise at least an 8 foot long by 2 foot square tank for that many Oscars.
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If your tank is at least 8 foot long by 2 foot high by 2 foot deep you may get away with a couple of each.
The Pacus are vegetarian and pretty harmless but they get very very large weighing in at around 30 Kgs (70lbs approx) when fully grown. Oscars are tiny by comparison. When fully grown they are only about 1.5 Kgs (4 lbs approx). Minimum sized tank for a couple of Oscas is about 72" x 18" x 18 ". You would need a very large tank maybe 10 x the size the Oscars need. Something that holds several thousand gallons of water to keep Pacus successfully.
hi im 13 ive had Oscars and are sensitive to nitrates you should be changing the water regulary and should have an air pump and they should have a big tank and not to many tank mates hi im 13 ive had Oscars and are sensitive to nitrates you should be changing the water regulary and should have an air pump and they should have a big tank and not to many tank mates
Tiger Oscars really should only be kept with Tiger Oscars. if you can find a fish that can grow to be equally large and have the temperament to survive with an Oscar then by all means try to keep them together, but Oscars will eat anything.
NONE Oscars are really messy and grow up to a foot! They need at least 50 gallons. For a 10 gallon I recommend some guppies and neon tetras.
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
The key for that will be strong powerful filtration. Oscars require a tank measuring at least 70 inches (about 180 cm) with a capacity of 100 gallons and up (about 400 liters). Due to its eating habit (messy eater that produces a lot of waste) water changes should perform often and powerful filtration system is essential.
When you can see they can feed and look after themselves well