It is funny how everything would have been fine had I not purchased a $7 fish. However, had it not been that, something would have caught up with me eventually.Good post there my friend. Like most of us that quarantine you thought you would get away with it and did for some time until one day your luck ran out... Some people continue to be very lucky but a parasite or disease will catch most out eventually.
As you say, we think nothing of spending hundreds, sometimes even thousands of dollars on our tanks but are loathe to spend even a small amount on something that could save you a whole lot of time, money and heartache in the long run.