With the poly barbs, you shouldn't have to worry about anything.
As a good plan, you'd want to do a few things:
1-pressure test your rig. Put pressure in the system, and look for leaks. If it passes a pressure test, odds are everything will be ok.
2-use hose clamps. I don't care how tight you think those hoses are on that barb, if the barb is damaged, a leak can occur.
What most people do here, is a 24hr test run (with the computer off). That usually brings up the issues that need immediate attention.
Once in a while, you'll want to check the coolant, to make sure that its color didn't change. If it did, then there's galvanic corrosion, so you have to keep using an additive, and replace it regularly, depending on how fast your coolant changes. That means flushing the system out.
The next thing is microbial infestation. If your water turns cloudy after 6 months or so, then you need to flush and refill. Running rubbing alcohol should clean things out. Some additives will prevent this from happening.
It's a good thing to keep the cover open, for the first couple of weeks that you are running the rig, just to keep an eye on any potential problems that might come up.
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