75 gallon tank with 2 oscars

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sammie replied the topic: Re:75 gallon tank with 2 oscars

Thanks guys for the comments! You guys taught me how to properly care for an oscar.

The tank dimensions are 4 foot long, 21 inch tall, 18 inch deep. I think the oscar is probably around 8" to 10". In May he was about 2" when I got him.

I have a bare tank because I was trying to limit the possibilities to get injured on decorations. Do your guys oscars stay injury free with decor in your tanks?

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S.S. replied the topic: Re:75 gallon tank with 2 oscars

Suprd71 wrote: Fish looks great, and I guarantee its your water change schedule that is responsible. If I may offer another bit of advice..... tank is quite barren. Oscar will appreciate some deco, even if just a hunk of driftwood and a couple of rocks. Maybe try a plastic plant or two.


It really seams just a temporary deposit. Some decorations would make it better. ;)

Suprd71 why are the WC responsible? Isn't 75% too much for the fish causing unnecessary stress once he never gets more than 10ppm on nitrates?
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Suprd71 replied the topic: Re:75 gallon tank with 2 oscars

@S.S.---- The cleaner the water the better a cichlid will do with growth, color and overall health. There is more than nitrate in the water that needs to be managed. Fish live in their own toilet, it needs a regular flush. There is no such thing as too much water change for an Oscar. I have done as much as twice DAILY 80% to tend to rescued Oscars with HITH, LLE etc. It works. The power of clean water should never be under estimated. I never measure nitrate, I have been in the hobby long enough to know that an aggressive water change schedule will keep the tank healthy. My tanks get 75%, give or take, every 3-5 days, depending on tank stock and volume. Could I do less and still have healthy fish? Some tanks yes, some no.


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S.S. replied the topic: 75 gallon tank with 2 oscars

I understand your point of view it makes sense but by the other end such large WC may disrupt the bacteria's in the filters and stress the fish due to two things. One is working on the tank and putting the fish almost on his side in the sand due to the height of remaining water and second due to de possible change in the parameters of water in the tank. Both may cause unnecessary stress to fish, I say may because if the parameters don´t change because the frequency is short in between WC and tap water does´t have changes (in some areas that may happen) then there are no significant differences in the water and fish will be adapted to that routine. If it works for you and most guys that's great!

As long as nitrates are low and untill this day I've always had my tanks under 20ppm most time even below 10, I do at the most a 50% WC a week or twice a week if necessary. ANd If it surpasses 20/30ppm then I'll do 50% every other day or daily if necessary but for sure that won´t happen because I tend to do not overstock or overfeed.

I´ve just remembered that a friend of mine has a system that the water is continuously entering the tank and getting out 24H a day, passing by filters first. He told me that the system changed 10 to 15% volume every day, but he had Discus that are recognized as a specie that only develops to full extension on regular WC basis. Maybe some day I'll do such a system for my tank because as you get older your ability to cope with WC decreases :)

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muddybear replied the topic: 75 gallon tank with 2 oscars

I'm on the large water change bandwagon too. All of my tanks get a fin level change every Monday and Friday. I can see no downside to clean water. As long as you treat your water properly with safe/prime, and match water temperature there should be no ill effect to your bacteria.
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sammie replied the topic: Re:75 gallon tank with 2 oscars

Suprd71, Can you tell me the potential growth of one oscar in a 75gal? It will still surpass 12" right?

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Suprd71 replied the topic: Re:75 gallon tank with 2 oscars

sammie wrote: Suprd71, Can you tell me the potential growth of one oscar in a 75gal? It will still surpass 12" right?

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Impossible to say how big any individual fish will get. Individual genetics are the factor. With optimum care it will reach its own maximum. I have had many Oscars over many years, some exceed a foot, some dont. Its like our species, some reach 7ft, some barely make 5. I will state however, that a really good sized Oscar, say 12+ins is going to be cramped in a 4ft tank. If your fish looks to be outgrowing the 75 some day, get him up to a 120or better. Chances to reach monster status increase with added living space.


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sammie replied the topic: Re:75 gallon tank with 2 oscars

Thanks Suprd71.

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