sick oscars

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bam225 created the topic: sick oscars

goodday everyone
i am having some issues with my oscars and its really bugging me.. because i hate to see my fish having a hard time.
wel to start from the start here it goes

i have a 135 gallon oscar tank wich is about 510 liter
i used to have one oscar in this tank the fish is about 12 inch. i had it in the tank for almost a year before i started introducing some mates in the tank i gave him 4 more little buddys. and vew months later one more oscar wich is about 8 inches.
i have 2 filters one is a eheim pro 600 and other one a sera 250
i never had issues with the fish but sinds a month or 3 my biggest oscar and the last one introduced in the aquarium started scratching, breathing trough one gill sometimes left one and sometimes right one. he lost some scales and has a swollen lower left side of his bottom jaw i gues all from scratching erratic swimming and bumping in to objects!
a month later the latest introduced oscar also started scratching and breathing trough one gill at a time.
now i did some test and the nitrates and amonias are all minimum and on the safe side. hardness is good there is plenty oxygen in there.
so i went to a fishstore and they examend the two fish with microscopes and they didnt find any parasites.
so i did a 80% waterchange.. that didnt help at all.
so i kept doing some minor water changes over a streched period.
that didnt help..
i started removing things like wood some stones.. it didnt help. i also changed the diet to pallets only. from frozen food like frozen shrimps frozen small fish. live maggots and worms
then i cleaned and filterd all the gravel
cleaned the whole aquarium (only water and spunge used to clean)didnt help at all..
the filter i cleaned one by one with a week or 2 in between the cleaning to keep bacteria in the water. no changes..
now i tried some meds i thought maybe some kind of fungus so i used esha 2000 like i am supposed to and that didnt help at all
i tried tremazol after that because i thought maybe some internat parasites.. didnt work at all.. made it even a little worse.. so i got back on the idea that the water quality may be bad and even worse now so i did some minor water changes over a period and let the bacteria settle in again.. but the fish doesnt change at al i tried waterconditioners..
also i tried toxivec in combo with nitrivec..
also didnt help

i forgot to mention that i also in between these steps above i didnt do a thing to the aquarium to let the batcteria thrive a little again..
the big red now even has a cloudy eye with a little red in it
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Suprd71 replied the topic: sick oscars

Hello and welcome. First off you have an extreme overstock and massive bioload. You would need 3 huge volume water changes per week, possibly more to keep water healthy. Your tank should have 2 Oscars only, not 6. How are you measuring water parameters and could you give specific numbers of ammonia, nitrite and nitrate? The cleaning of filters is a concern. All your good bacteria lives in the filter bio media, it is not free swimming in the water. No meds will work in anything less than very clean water. What you describe in your fish is directly related to high toxin levels in the water, particularly the cloudy eye. What you seriously need to do is reduce stock to a manageable amount, and pound as much clean water at the tank as possible. Every day if you can


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bam225 replied the topic: sick oscars

the brand is sera. i believe its german and the date is fine. i tested exactly as it says on the manual.. i dont know what to do only thing i can think of is to much water change! so maybe i should try not doing a thing for a long while again
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Suprd71 replied the topic: sick oscars

Ok.. I wonder at the quality of your test kit. I am not familiar with that brand. Is this a liquid kit? Possible its expired? Up until the trouble, what was your regular water change schedule? I ask because of what you report, that being everyday changes making things worse. Possible osmoregulation issue, throwing gobs of clean water in, when fish were sort of conditioned to iffy water? Dont underestimate the bioload produced by Oscars, even little 3 inchers are messy fish. Your fish's ailments are certainly water related, we need to determine how the water is turning to dangerous conditions.


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bam225 replied the topic: sick oscars

i really dont know what to do.. should keep changing water or rely on the liquid test kits and leave water alone!

could bad water carbo hardness be a issue?
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Suprd71 replied the topic: sick oscars

Clean water is always the first step in any treatment, as meds wont work in poor water. What is the Ph, Kh and Gh out of your tap? Any nitrate in it? There is more benefit to clean water than just removing nitrate. I would continue an aggressive water change schedule.


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bam225 replied the topic: sick oscars

i will do 20% daily what do you think?
and in meanwhile try and find a new home for 3 of my oscars.
i will post the values tommorow
its late in the netherlands atm.
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Suprd71 replied the topic: sick oscars

I dont think 20% daily will even keep up with bioload. 50% will be more successful. I would honestly keep only 2 Oscars. Tank size aside, 3 is a very odds against number to work out. If 2 pair up, the 3rd will be in trouble.


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bam225 replied the topic: sick oscars

ok ill try cleaning the water at 50% still it goes against my intuïtion because the testers tell me the water is ok.
i am really scared that to much water change is bad so ill try and get them a new home asap
btw i have 2 spotted catfish in the tank.. and they also clean my oscar from now and then i see them swimming over his body can this be bad or is this ok?
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DRACO replied the topic: sick oscars

whenever fish acquired cloudy eyes, always do large water change
without cleaning the filter... in most cases, cloudy eyes is a result
of ammonia burn.... water parameters is always based on figures...
ammonia=0, nitrite =0, nitrate = 20 or lower, pH= 6.8 to 7.5

catfish swimming over oscar's body spell disaster...
it stress the fish and expose to irritation... sooner,
you will find the oscar without intestine...

further, large water change will not harm the fish if done the right way
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