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I only plan on using the water heater when im not playing the xbox. The oil will keep the water plenty warm. I will be monitoring temps with my thermocouple. My plan is to keep both the oil and water no hotter than 75°F, if that fails then i will be adding a pump and radiator.
Yeah i can understand why yours gets so hot lol, you also have your power supply in with the oil. That will increase the temp tremendously. I will be doing lots of testing with temps before i throw some poor little fishys in it lol. Im hopeing with all the cooler fresh water on the other side of the divider, that will help a bit to dissipate the heat. If not i will work with some peltier coolers before i go to a radiator and fan since my budget on this entire project is $100. Im only $20 into it.
Mineral oil and glycol might not be the best thing. I've used stuff called PC Ice. its supposed to be corrosion resistant and is safe with most plastics and is non-toxic.