Has to live alone

[Litespeed]

We have one tiger barb that is slightly slower then the other barbs. When we kept him in the main tank he would get attacked and have his tail eaten off. I'm assuming it was the red tailed shark that was doing it, but don't know for sure. We moved him to the quarantine tank and put in Stress Coat and within a couple of weeks the tail had grown back. We again put the fish back in the main tank and with in a couple of days, it happened again, but worse this time. We have decided to keep the fish in the quarantine tank by himself, he is all healed now and seems very happy to have the whole Q tank to himself and looks better then ever. If this is the only way that this fish can live a happy life, I'm more then willing to keep the Q tank up and running for him.
Should I keep adding Stress Coat to the water each week when I do a water change?

[Lady Hobbs]

You need not add the stress coat now that he's healed up.

You may feel bad that he's alone but he's probably lovin' not being attacked.