Don’t quit, what seems to set you back now will only lead to eventual success. I’m new to the hobby and was welcomed with a velvet outbreak that killed all my new fish. I did not act fast enough, but now know what I should do in the future. I picked myself back up, learned from my mistakes, and now have a QT tank which I will use for everything. I suppose it comes down to this—are you willing to spend a few hundred dollars and lots of time on a quarantine tank and medication, or possibly need to replace thousands in fish and coral down the line?