Please help me basicly i have an oscar about 4 inches in length but i would like to put some more oscars in the tank as well i tried it once befor and it didnt end to well so if anyone has any advise it would be very much appricated thanksss

Welcome to the site

You should look at what happened before and learn by any mistakes you may have made such as aquarium size, lack of knowledge regarding water quality and preparing a tank for fish. You have been rather vague in the information you have given us, if you could tell us a little bit more about your self, what you have got now regarding tank size and filtration, maybe we could give you some advice.

There are plenty of people here that will give you all the advice you need, just give us information and let us do the rest.

first off, welcome to OFL!
adding new oscars into an existing oscar tank can become troublesome for several reasons.
most common is territorial aggression.
this will happen often due to keeping more oscars in a "small' tank.
we recommend at least 55Gl per oscar.
how big is your tank?

plus there's a big chance you might have a male oscar to start with.
in that case, adding another male will lead to fights, liplocking and other aggression and eventually death of one of the fish.
a male and a female or 2 females can live peacefully together.
The lack in difference in outward appearance between male and female oscars makes that adding a new one will allways be a guess.

rearranging the decorations, before adding a new fish may help, for the oscars will have the idea they'll have to conquer the territory all over again.

i put a 7" tiger into a 11" red's territory this year, and i consider myself lucky that it all went smooth.
They actually seemed to have formed a pair, but it's allways a risk

You may have a bad tempered oscar, and i heard enough stories of oscars killing any tankmates, time and time over again.

okay here we go haha ............ my tanks is 90 gallons, and has a eheim filteration system , and also im only 15 so please dont tell me i have to go spend fortune on somthing for the tank haha , also a little bit about me , im 15 and lived in england all my life im very cean on aquatics and previously have had up to about 6 tanks going in my room haha.

ok, 90gl minus 55gl leaves you with 35Gl to stock.
That means you cannot put another oscar in that tank.
there's simply not enough room.

If you were to put another oscar in that tank, you will have agression all over again.
Plus the bioload will leave you with the need for religious waterchanges, several times a week, once your O's start growing.
And that's no fun, i can tell you.
IMO a 90 Gl is very cool for a single oscar.
Keep in mind that your fish will reach 10" within a year and will most likely exceed the 12" when adult.
A 90Gl will seem small allready then.

I suggest to forget about another oscar, just spoil this one to make it become real big and healthy.
You could still add some smaller tankmates, though!

Okay ill try that thankyou very much

You're welcome.
In case you missed this:

www.oscarfishlover.com/oscar-fish-tankmates

Good luck on the hunt for suitable tankmates!

I disagree with Noddy, at 4 inches you easily add another oscar but you should be prepared for large and frequent water changes!!!!

Regarding adding another oscar, I would rearrange the decor and then add him. But have a divider handy in case the new one gets beaten up

Noddy wrote:


surely at 4 inches there'll be no problem, but better to be prepared for the future.
With no possible means of upgrading, the way it looks now!

2 oscars in a 90g is easily maintained but you have to keep on top of it

i think me and noddy will have to agree to disagree

Not a good idea to add another Oscar....mainly we are talking aggression issues hear not bio load.
But at the same time fully grown in a 90 gallon your going to be water changing your arse off!!