Decorations will just get in the way. Eastablished oscars will often
arrange their tank how they see fit regardless, so patience is a must.
However, a breeding pair will often ruin a tanks decor in no time as
they prefer either smooth shale rock, or the glass bottom to lay their
eggs. A literal nest will be established in the tank as a large dug out
hole where the parents will focus on protecting the fry and eggs. This
is why such a larger tank is needed for a breeding pair, and why a
breeding pair with any other fish needs an even larger tank!
Raising the temperature in the water to around 82-84 will promote
breeding activity. Keeping regular water changes active and all the
usual maintanence up to date will ensure a healthy offspring. Its
really up to you to control the environment, but any breeding may or may
not happen regardless of what you do.
Oscars will activly seek mates at a medium size. Mature oscars are
usually said to be full grown oscars, but they can actively breed at
much smaller sizes. Usually within the first year of life oscar can
establish offspring. However, true breeding becomes a full time
activity when a mate is found and isolated. This is how you keep
offspring coming. Otherwise inside a tank with multiple mates or fish,
fry are killed, pairs are ruined, or theres simply too much chaos to set
up shop to find any real success.
So...once you find a pair, keep that pair alone. 90 gallons per
breeding pair is what I recommend. You really cant afford to go lower,
and once you have your fry what to do with them?
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