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View Full Version : two oscars in a 55g tank?



caitandjason
08-24-2007, 02:34 AM
Hi, I'm new to this forum but I have had an oscar fish since I was born. We had a quite large one, a cat fish and a plecto in a 45 gallon tank and he was as happy as could be.

I recently got a 55 gallon tank and was wondering if you guys thought that two oscar fish would be happy in it?

YaYgoldFish
08-24-2007, 02:36 AM
Most probably not..You could get away with one tho, maybe with a common pleco ?

Drumachine09
08-24-2007, 02:39 AM
No on the common pleco. MUCH to big for a 55.

No on the 2 Oscars as well.

What is your filtration, water change scedule, and waterchange amount?

caitandjason
08-24-2007, 02:39 AM
I heard that one of their tank mates was an iridenscent(sp) shark? Would that be okay to have the oscar and a plecto in that size tank?

This is the first time i've lived on my own, and my mom has always really taken care of them, so i'm going by memories! So I appriacte any help I can get.

TowBoater
08-24-2007, 02:40 AM
I would say at the very least a 55g for one, a 75g is better for one, a 100g is needed for two.

caitandjason
08-24-2007, 02:43 AM
I have a over the back filter and thats all i pretty much know about it..it came with the tank. I haven't changed the water yet and all i have in it is rocks and the bubble wall. I"m letting it run for a few days... but when i was at home I would clean it once a week and about 50 to 75 percent water change. along with taking out the plants and what not and rinsing them off.

55g is about as big as i can have in my apartment right now. so anything better would have to wait about a year until i move out into something bigger.

TowBoater
08-24-2007, 02:44 AM
Maybe one, better to get like a pair of jacks. I am sure you will need a better filter, what kind of HOB is it?

YaYgoldFish
08-24-2007, 02:44 AM
In your 55g get an oscar and leave it like that, your oscar will be much happier in the long run.

small tip: When you do water changes, 50% in enough but NEVER clean off plants and ornaments, you will loose some good bacteria, just leave everything as it is, except for the weekly gravel vaccum(25%-50% water change) and cleaning the filter once every other month or so..

TowBoater
08-24-2007, 02:51 AM
Also the tank needs to cycle, oscars are messy fish.

cocoa_pleco
08-24-2007, 03:06 AM
theres so much controversy about oscars now. i read a book by a guy who kept oscars for over 20 years and swears that one can happily live in a 29g with 50% water changes weekly. other times its a 55g is sufficient, and sometimes a 75g. one oscar is best alone in a 55g. ID sharks get big and one oscar and one ID need a 100g to eachother.

caitandjason
08-24-2007, 03:15 AM
the only thing i could find out about the filter is that it's a aqua-tech power filter. model 30-60 and and i think the filter cartrdges are called bio-fiber.

caitandjason
08-24-2007, 03:17 AM
this is prolly a dumb question but when you say it needs to cycle what does that mean?


nevermind i found out.

AquaQueen
08-24-2007, 03:34 AM
Welcome to Ac you should try reading the Free Aquarium EBook in the Menu to the left there is alot of useful info there.

cocoa_pleco
08-24-2007, 04:10 AM
Welcome to Ac you should try reading the Free Aquarium EBook in the Menu to the left there is alot of useful info there.

ditto on that, a cycled tank is the main key to a healthy tank

genitor
08-24-2007, 04:20 AM
theres so much controversy about oscars now. i read a book by a guy who kept oscars for over 20 years and swears that one can happily live in a 29g with 50% water changes weekly. other times its a 55g is sufficient, and sometimes a 75g. one oscar is best alone in a 55g. ID sharks get big and one oscar and one ID need a 100g to eachother.


I've always though that it's the dimensions of the tank that matters and not the volume of water it holds. If the tank has enough surface area for the fish to swim around happily then the water parameters can be kept in check with adequate filtration and water changes.

cocoa_pleco
08-24-2007, 04:22 AM
lol, like i said, its gotten crazy. some people say yes to a oscar in a standard 55g and some say no that it wont be able to turn around. im sure a more square 29g would work for a single one though

tropfish
08-24-2007, 12:54 PM
i've read that too in the guide to freshwater aquariums book. It said that with double filtration, 50+% weekly w/c's and no other tankmates an oscar can be kept in a 29g

cocoa_pleco
08-24-2007, 02:35 PM
i think that if you ask people they say 55g min and books say 29g. all my books, even the ones from the 80's and some from 2004 say 29g min

Fishguy2727
08-24-2007, 03:01 PM
A person can live in a closet, period. You keep their air clean, give them good food, they can do jumping jacks, they will be okay and live for quite a while. But that is not even close to thriving. That is the key here, thriving. A 29 for an oscar is a really bad idea. These fish can hit 15-18". In general a 75 is the minimum for one. In a 75 you could have two. Yes, the dimensions can also make a difference. A 50 gallon (36x18x20) would be okay for one, but since that is not a common tank size, it is left out when discussing minimum tank sizes.

The nitrifying bacteria mainly colonize the filter media. There are traces in other places in the tank (gravel, decor, glass, etc.) but not enough to worry about. Effectively all of it is in the filter.

Oscars are great, but I would suggest some other type of cichlid in that size tank.

tropfish
08-24-2007, 03:18 PM
I totally agree fishguy. Don't get a fish if you can't give it the conditions to thrive.

cocoa_pleco
08-24-2007, 03:24 PM
and if you already made the mistake of puting a large fish in a small tank, either buy a larger one (most times 55g and up) or sell it.

TowBoater
08-24-2007, 11:21 PM
Yup, I think me and fishguy are almost always on the same page but he explains it a tad better.:ezpi_wink1:

Lady Hobbs
08-25-2007, 03:53 PM
I think people, when the think of tank sizes, always think of the length. They don't consider the length of the fish and the width of the tank in their plans.

They must be able to turn around.

genitor
08-25-2007, 06:15 PM
When thinking about which size tank for which fish I always think tank dimensions and then calculate the gallons afterwards to see what it works out to. Here is a very useful link that gives a guide to calculating tank size for a given fish.

http://malawicichlids.com/mw01019.htm

zackish
08-25-2007, 07:47 PM
I definitely could not see a full grown oscar in my 29g he couldn't even turn around.
But as far as your water change and cleaning schedule you sound good. Maybe get a better filter. Since you have been keeping oscars for a long time maybe consider something new in your 55gallon? A community or cichlid tank?

freshwaterfishlover
08-26-2007, 01:51 AM
1 Oscar in a 55. 2 in a 75 or up.

cocoa_pleco
08-26-2007, 02:01 AM
1 Oscar in a 55. 2 in a 75 or up.


again we need to go to the dimensions issue. a standard 55g width makes it hard to a oscar to turn around

Fishguy2727
08-26-2007, 01:25 PM
In any setup the fish should not be any longer than the width of the tank. There are a few exceptions where really long fish do not need the width because of the way they turn around (best example is eels, they don't stay straight as they turn around). So let's see, oscar: 15-18"+ and 55 gallon tank: 12" interior width. 12 is less than 15, so they should not be put in a 55. Yes, of course you can cram one into a 55, but that is not helping them thrive. I can cram my guests into a small walk-in closet to sleep in for the night, but they probably won't come back to visit, at least not overnight. Oscars: 75 minimum for one or two.

2manyfish
08-26-2007, 09:07 PM
I can cram my guests into a small walk-in closet to sleep in for the night, but they probably won't come back to visit, at least not overnight.


Now there's an idea!! :hmm3grin2orange: