I'm usually great about washing my hands before working in the tank for the inhabitants sake and washing them after finishing up for my own sake.90% of the time my hands are in the tank, I'm using gloves
But honestly it's mostly to get the salt water feel off of my arms as much as any concerns about general health.
Healthy adult with no cuts on hands, good eating habits eating real food and a good immune system. [emoji4]
5 different types of paly's in the 75 gallon tank including 30 Grandis. No fragging.
I have no issues.
Your Mileage May Vary.