Oh, well otos need a group of six or more as well. These are peaceful fish, but they are only ideal for a very mature tank as they can be sensitive and they don't always take prepared foods. I'd return this one as well.
Some fish tolerate ammonia better or don't show symptoms in the same way. Definitely check your stats with a liquid test. Small amounts of ammonia over a long period can cause nearly irreparable damage.
Some fish tolerate ammonia better or don't show symptoms in the same way. Definitely check your stats with a liquid test. Small amounts of ammonia over a long period can cause nearly irreparable damage.