Im building my own DIY watercooling system and I want to know if I can mix metals. I heared that Aluminum cant be mixed with copper in watercooling setups because of corrosion. I already made the waterblock, its all aluminum with zinc coated brass fittings, so I think the radiator will have to be made of aluminum too, right? Im with a very tight budget so were can I find a good radiator or heatercore? The pump is 15€ at a petshop.