2 Oscars in a 75 gallon tank

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Vibs created the topic: 2 Oscars in a 75 gallon tank

How difficult is it to keep 2 oscars in a 75 gallon 5 ft tank? Breeding pair..10 inches each.. In fact I have 3 breeding pairs in my 75 gall for the last 5 months, but was gently advised a couple of days back, on another forum to reduce it down to ONE SINGLE OSCAR. Well since I don't want to separate any of the pairs,
I have decided to keep one pair.
The other option I have is to keep one single Oscar (9 inches), One Buttikoferi(6) and One Jaguar(6).
Currently I change, close to 30% water everyday & 50-60% on Sundays. I have a SUNSUN 304, an Overhead Filter and sponge filters.
Another question I'm not sure I should ask... But here goes...may sound ridiculous to many of you... but It's a serious question..
If I keep 4 (9 Inch) oscars in the 75 gall and do a 100% water change - once a week.... with 30% WC every day.. is it ok??
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OFL replied the topic: 2 Oscars in a 75 gallon tank

Hi there

The advice we always give people if they want two Oscars is tank must be absolute minimum of 100 gallons, preferably more . Trying to keep two large fish in a 75 gallon aquarium is not easy because keeping the water condition could would be quite difficult. My first aquarium was 75 gallons way back and I myself had two Oscars to begin with. When they got to about 9 inches I realised that the tank wasn't really suitable so I upgraded to 125 gallon. It really does depend on what sort of filtration you've got. If you've got very powerful filtration then obviously the chances of keeping the water in good condition are increased.

Do you check ammonia and nitrite on a regular basis? If so, what readings are you getting? Also, what is your nitrate reading at the end of a seven day period? If you've got that many fish in a 75 gallon tank then you on my tray level is going to be extremely high after even three days. Nitrate isn't as toxic as ammonia or nitrite, but Oscars can be susceptible to poor water conditions, therefore we always advise not letting nitrate levels exceed 40 ppm for too long.

The advice the other forum gave you is basically what I would say.

9 inch Oscars will grow into 11 inch Oscars within a few months.4 Oscars in a 75 gallon aquarium will just cram them together and you'll probably end up with serious aggression. Also, changing 100% of the water every day is going to completely stress the fish out. And you'll probably end up upsetting your biological filter as well.

If you want more than one Oscar then upgrade your tank, that really is your only option.

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Suprd71 replied the topic: 2 Oscars in a 75 gallon tank

Regardless of attempts to keep water clean, there is another important factor in successful Oscar care. Tankspace. Fish will come down with stress related health problems due to overcrowding. Butti and Jaguar can likely out grow an Oscar and are guaranteed far more violent. They should not be in the same tank of any size. An angry and stressed out Jag could kill everything around it very quickly.


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Vibs replied the topic: 2 Oscars in a 75 gallon tank

OK.. Thank you boss.. And suprd71.. Here's what I am going to do.. And I'm really sorry if I come across as an adamant idiot.. Which I could be.. I will br returning 2 oscars..I'm keeping the 2 breeding pairs in the 75 for the next 4 months.. They have been very peaceful for 5 months now.. Keep the water changes at 50% a day with 90% every Sunday.. In April I plan to get another 75.. Where I will relocate one pair.
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acdcking12 replied the topic: 2 Oscars in a 75 gallon tank

I have one fully grown Oscar in a 75 gallon tank. I typically do a 90% water change every other day. I cannot imagine having a second Oscar in that tank. I would be doing 3 water changes a day.
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Vibs replied the topic: 2 Oscars in a 75 gallon tank

OFL wrote: Hi there

The advice we always give people if they want two Oscars is tank must be absolute minimum of 100 gallons, preferably more . Trying to keep two large fish in a 75 gallon aquarium is not easy because keeping the water condition could would be quite difficult. My first aquarium was 75 gallons way back and I myself had two Oscars to begin with. When they got to about 9 inches I realised that the tank wasn't really suitable so I upgraded to 125 gallon. It really does depend on what sort of filtration you've got. If you've got very powerful filtration then obviously the chances of keeping the water in good condition are increased.

Do you check ammonia and nitrite on a regular basis? If so, what readings are you getting? Also, what is your nitrate reading at the end of a seven day period? If you've got that many fish in a 75 gallon tank then you on my tray level is going to be extremely high after even three days. Nitrate isn't as toxic as ammonia or nitrite, but Oscars can be susceptible to poor water conditions, therefore we always advise not letting nitrate levels exceed 40 ppm for too long.

The advice the other forum gave you is basically what I would say.

9 inch Oscars will grow into 11 inch Oscars within a few months.4 Oscars in a 75 gallon aquarium will just cram them together and you'll probably end up with serious aggression. Also, changing 100% of the water every day is going to completely stress the fish out. And you'll probably end up upsetting your biological filter as well.

If you want more than one Oscar then upgrade your tank, that really is your only option.

ok.. so i managed to sell one breeding pair and one single oscar.. Now I have one breeding pair in the 75 gall... which I found out a couple of days back.. is actually a 94 gall.. 24*16*60 inches.. now I DONT want to give away the third fish.. and the only moulded glass tank available is a 45 gallon.. its a nine inch BRIGHT Albino Tiger.. very very beautiful..should I go ahead and buy the tank to keep him in..??? also there is a 6 inch parrot which I had for 2 years... went to a friend... came back.. can i keep him with the breeding pair in the 94?? coz i dont want a third tank in the house..
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Vibs replied the topic: 2 Oscars in a 75 gallon tank

acdcking12 wrote: I have one fully grown Oscar in a 75 gallon tank. I typically do a 90% water change every other day. I cannot imagine having a second Oscar in that tank. I would be doing 3 water changes a day.

ok.. I need to know this.. why do you do a 90% water change every other day? Is it because of the nitrate readings? I thought that by reducing the population I will finally get a break from this 50 and 90% water changes.. and what is every other day? your post has definitely got me a bit worried....
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OFL replied the topic: 2 Oscars in a 75 gallon tank

I think it would be a good idea to monitor nitrate levels for a few days and see how high they get on a daily basis. After water change, leave it for about four, five hours and then carry out a nitrate test. Then do another one for the next two or three days and make notes of the different each day.

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acdcking12 replied the topic: 2 Oscars in a 75 gallon tank

I apologize Vibs. I didn;t want you to worry. My water has Nitrates in it already of around 20 parts. So I do 90% every other day and use Prime to neutralize it. But that is only good for around 48 hours. So I keep up the every other day water changes so I can continue to use Prime. Vicious circle for me. But it is for the fish that I do this and he is doing very well.

You may not need to do go to the extreme as I have.
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Vibs replied the topic: 2 Oscars in a 75 gallon tank

acdcking12 wrote: I apologize Vibs. I didn;t want you to worry. My water has Nitrates in it already of around 20 parts. So I do 90% every other day and use Prime to neutralize it. But that is only good for around 48 hours. So I keep up the every other day water changes so I can continue to use Prime. Vicious circle for me. But it is for the fish that I do this and he is doing very well.

You may not need to do go to the extreme as I have.

phew.. Ok.. Thanks.. If you don't mind me asking.. How long have you been in this hobby? And do you think you would one day get mentally and physically tired doing these relentless water changes? Or what if you have to leave town for a few days??
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