Popular tanks are community tanks with a mixed variety of compatible fish, cold-water goldfish tanks, or specialized, such as piranhas, discus, oscars or bettas.
(Popular tanks; are; community tanks with a mixed variety of compatible fish, cold-water goldfish tanks, or specialized, such as piranhas, discus, oscars or bettas)
Popular tanks
are
community tanks with a mixed variety of compatible fish, cold-water goldfish tanks, or specialized, such as piranhas, discus, oscars or bettas