What are the easiest small cold-water fish to keep?
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Expert Answer
Easy-to-keep small cold-water fish include bettas, red tetras, bitterlings, comet goldfish, white-cloud mountain minnows, koi, and yellowfin bream. The most ornamental is the koi — with over 1,400 varieties derived from mutated carp hybrids, it has brilliant colors (gold, red, white, black). Koi are long-lived and tolerant, often kept in park ponds, and symbolize good fortune and happiness.