Just give Pacific Coast a call , they will send you fuses for free.
But the reason you are blowing fuses is most probably ,you don't have your flow right ( GPH) . On my 120G ( the one I have for sale) I had problems until I "dialled in" the GPH, but once I did that , I have had no fuses blown for two years.
If you have a CL-650, the manual recomends 650GPH , and that is measured at the end of the pipe/ outlet where the water pours back into the main tank. I used the head loss calulator on RC. Also the GPH you are shooting for on the calulator must be 100GPH more than your target GPH , because that is about how many GPH the chiller will restrict the flow.
Also after a call to Pacific Coast about useing a CL-650 on my 250G new set up ( the CL-650 is only rated for up to a 180G , the reason for the call ) they told me , that after rescent testing they have found that their posted GPH's are a little low and a CL-650 will work best at about 800 GPH .
HOPE THIS INFO HELPS
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