Hows so? Coming from a place like a river in the amazon to a tiny 300g tank is hardly ideal.No. Oscars and midevils in a 300 is very different from that.
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Even with water changes, our nitrates are far higher than in the wild. One of the reasons that our fish die earlier and get sick more often.I guess we would be if we didn't do any water changes or heat the water somehow and keep our fish in a tank that they can hardly move in..