Just a quick question

Recently I bought 10 Corydoras fish- 4 Corydoras Melanistus, 4 Corydoras Sterbai and 2 Corydoras Adolfoi. They are in 17-18 gallons fish tank with good water parameters, white soft sand, microsorum plants and no any other inhabitants. All they are active, eating well. The problem is that when I put the corys in the tank I noticed that 2 of my Corydoras Sterbai are with damage barbels, or with other words the barbels are simply missing. So is it possible after a while the barbels of these particular fish to be recovered?
Thanks in advance!