You've got an odd assortment of fish in that tank. If fish aren't kept in their proper school numbers, they may exhibit aggression. Your tetras are really happiest in schools of 8 or more.
Obviously, you cannot raise the levels of all of your species to their proper amount, so if I were you, I'd think about what I might really like to keep and rehome the rest.
Tiger barbs are quite often in species only tanks as they are highly aggressive and just downright nasty. It could very well be the tiger barb that's causing the problem.
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75: blood parrots, featherfin cat, emperor tetras, turquoise rainbowfish, BN plecos, japanese trapdoor; 46: WCMM, gold inca snails, ghost, bamboo & amano shrimp, kuhli loaches, rummynose & ember tetras, endlers, platies, flame gourami, guppies; 16: pygmy, peppered, loxozonus corys, otos, assassins, RCS ... ~ Research PRIOR to purchase.... ~
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