You will find that most fish (though not all) will adjust to pH as long as it is consistent. Tiger barbs, when kept in a school, do well and are fascinating to watch. However, if kept singly, the are notorious fin nippers.
Make sure that your ammonia and nitrites stay at zero, and keep an eye on your nitrates. Regular water changes, along with responsible feeding, will go a long way toward keeping your water healthy.
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