Don't worry about the noise from the 120mm fans. If it turns out to be too loud, then put a potentiometer in line on the power line and mount that to your case somewhere. When your system is set up, "tune" the potentiometer to give you the right balance of noise to cooling ... plus it'll be a conversation piece on the front of your case and allow for quick tuning while doing OC testing and when lanning (suddenly you're in a garage that is about 110F with 15 stinky teenagers and you need extra cooling). As far as galvanic corrosion and algae growth, try to use similar metals throughout your system. If you use a copper block, use a copper based radiator. Same thing with aluminum. Your res/air trap and pump should have no metal components, and using nylon/pvc barbs whereever possible will negate nearly all galvanic corrosion in your system. There is no better way to solve that problem. As far as algae goes, use water wetter or something similar, or if you're on the cheap, pour about 1-2 tbsp per L of isopropanol (rubbing alcohol) in your coolant and it'll kill the bugs without dropping performance. With a setup like that, if you pressure test it and recheck all fittings repeatedly before installation AND make sure there are no places in your case that can cut your hose due to vibration, you should be able to go weeks in between checks. I haven't opened my case in almost three weeks except to briefly show off the guts a couple of times. The easiest way to leak check is to build a "snorkel" style air trap into your system and mount it externally to the back of your case. All you have to do to check for a leak is pop the cap and check the coolant level. I do that weekly. I hope that helps a little.
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