No, it's not. The cellular metabolism of your oscar would foul ten gallons of water in less than a day. It's not the size of the fish, its the rate of cellular activity. A four inch tetra that is full grown would be happy in there (waste-wise), but your fish is trying to grow right now. Almost every cell in his body is dividing and producing waste products exponentially. Every single day he is in that tank his life is probably shortened by a week. How are the nitrates anyway? You change the water once a week? I'd be doing 50 percent every day if somebody shoved me into caring for that set up. You've got to keep the nitrates as low as possible so he doesn't succumb to HITH and metabolic saturation.
But we still want to help you care for your oscar. There's no reason you should be ignored for harming your fish. The goal is to improve your situation. So don't be afraid to keep asking questions! As suggested, craigslist is usually loaded with cheap tank, containers etc. Heck, I've seen 300g + tanks go for free during home renovations. Just check first thing in the morning and nab one. It might take a week or two, but it's the most responsible thing to do for your O at this point, besides vastly increasing water change quantity.
But we still want to help you care for your oscar. There's no reason you should be ignored for harming your fish. The goal is to improve your situation. So don't be afraid to keep asking questions! As suggested, craigslist is usually loaded with cheap tank, containers etc. Heck, I've seen 300g + tanks go for free during home renovations. Just check first thing in the morning and nab one. It might take a week or two, but it's the most responsible thing to do for your O at this point, besides vastly increasing water change quantity.
