Oscar Scratches and marks

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sbrennan1982 created the topic: Oscar Scratches and marks

HI Guys

I'm an experienced Cichlid keeper but relativity new to Oscars and I've got 3 x 8-9 inch Oscars in a 450 litre tank. It’s filtered by 2 x Eheim professional 3 600 litre that also contain seachem purigen and a huge UV filter.

I do 50% water changes every Wednesday and Saturday. My Ammonia and nitrite are zero and my nitrate is usually between 10 and 25 ppm when i do my water changes.

The thing that's confusing me is they all seem to be constantly getting these marks on them that i can only assume is from biting each other but I never see any aggression between my Oscars?

They are all eating well and seem fine when the tank lights on but they all seem to lie on the bottom when the lights off even if its daylight. is it possible they would only be aggressive to each other when I’m not here? if they are is this amount of damage etc going to stress the fish and cause problems?

I have tried hiding with the lights in my living room off to watch for aggression when I’m not there but I didn't see any?

s79.photobucket.com/user/Ste_Brennan/media/scratches2_zpsdc138000.jpg.html

s79.photobucket.com/user/Ste_Brennan/media/Scratches1_zps6fec8b00.jpg.html
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  • OFL
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OFL replied the topic: Oscar Scratches and marks

I've had a look Other photos and I personally don't think there's anything to worry about. The superficial injuries certainly don't look like a hole in the head To me. In fact, if you look at the first photo, you can see the injury on the head quite clearly, it looks like it's obviously bumped into something, rather than a pit that is caused by the hole in the head. Have you noticed the Oscars fighting at all? What about at night, do you hear lots of banging and loud noises coming from the tank? This is normally what causes these injuries.

Your aquarium is 450 L, of the top of my head that's around 90 gallons. We would normally recommend a tank in excess of 100 gallons, however you seem to have fairly good filtration so I would certainly not recommend you keep any other fish with these two Oscars because you are slightly overstocked with just the two Oscars. You will have to keep a very close eye on the water conditions for the foreseeable future.

I may not always be right, but I am always the BOSS :-)
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sbrennan1982 replied the topic: Oscar Scratches and marks

HI Thanks

Good guess i just checked and 450 liter is 98.9861 imperial gallons lol. The Tanks 5x2x2 But I have got 3 Oscars in there.

Wow i was advised I needed 45 imperial gallons for one Oscar and another 20 for each additional one so i thought my stocking level was spot on?

I have got 5 tanks and from what your saying it sounds as though I may have to do a re-shuffle in the future and move one of them. I haven't noticed anything at night but my bedrooms far away from the tank so it is possible they could be squabbling at night.
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DBLN8 replied the topic: Oscar Scratches and marks

Welcome! the marks all appear to be "battle scars" looking at the pictures you provided you appear to have more than just 3 Oscars in the tank.
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Lammergeier replied the topic: Oscar Scratches and marks

Oscars need 55 US gal each as a bare minimum. You could maybe just squeeze two oscars in your tank but that would be pushing it. To comfortably keep three you'd need to have a 6x2x2 180 US gal.

The reasons why are a combo of waste production and territory requirements to minimise aggression. I'd suggest not keeping 3 together even if you had the tank space. It seems as though yours are not getting along, and from what I know generally with 3 oscars you'll end up with WWIII or two will pair up and exclude the third, or worse. I've seen one unlucky third oscar end up with its tail bitten off to the caudal peduncle due to pair aggression.
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sbrennan1982 replied the topic: Oscar Scratches and marks

Yeah there are a few convicts ect in the tank at the moment but just temporarily. i'm holding them for my mum and Dad whilst they are having a tank built into a dividing wall. they will only be in here for a month nor two so will be gone well before the Oscars get to adult size.

Ok thanks ill move my tiger Oscar to another tank with my electric blue jack Dempsey hes only 4 inches and very peaceful.
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DRACO replied the topic: Oscar Scratches and marks



nothing to worry about the scratches provided you keep the water in good condition
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streetsmart73 replied the topic: Oscar Scratches and marks

hi there


1. welcome to ofl.
2. from those shots, the "wounds" will heal fast.
3. maintain good water parameters throughout.
4. in the comm tank, there bound to have such scratch marks due to aggression.
5. good looking Oscars.

"somewhere in time ... gone with the wind"
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