Hope you running water wetter in there. Mixing alum & copper in the same system is a bad idea.
Does the rad feel hot? If not it is possible you've not got enough flow.
I'd replace the pump - rio don't have a good reputation for reliabilty. Depending on case space try a Eheim 1250. Alot of people swear by the Magdrive 500 pumps as well.
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