Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
#1: You should have really posted that in the Watercooling forum.
#2: If installed correctly it's very safe.
#3: If you don't install it correctly you're replacing your parts. Who did you think would? The manufacturer of the watercooling gear? You're the guy who decided to put water inside your computer.
#4: If installed correctly it's not going to leak unless you're playing with the hoses and clamps on a daily basis.