Thats a long time running. My chiller runs about 4 - 6 minutes to lower the temp about one degree, I have a 110gl sump and a 75gl display tank. Not sure where you have your controller settings, but anyways in order to get a more efficiant transfer of heat sounds like you need a slower water flow. Not sure if you have a seperate pump or if you have it plumbed into your return, but if you have a seperate pump you can place a shutoff valve partically open to adjust the flow...
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