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I recently added 5 neon tetras and 1 bristlenose plec.not from breeding.
its either a bacterial or protozoan infection, most likely bacterial.
what else is in the tank?
do a 75% water change and gravel clean the substrate. make sure new water is free of chlorine/ chloramine before it's added to the tank.
add 2 heaped tablespoons of rock salt, sea salt or swimming poll salt, per 20 litres (5 gallons) of tank water. keep salt in tank for 2 weeks and see how they go.
if it gets worse rapidly you will need a broad spectrum medication to treat them.