thank bros for the feedbacks, looks like sicce is out of the picture now, i saw the or6500 in operation lastnite when i was buying my "new chiller" amazingly it runs with no heat externally, if thats the case then i can run it internally without heat too i suppose , but what eheim has is the heat protection which i have personally witness the effect, my CR union joint crack and leak water which i did not know, when i reach home the 1250 for the CR circulating pump was already running dry and when i touch it, it was very hot, but no choa tar smell, but i tot there goes my "2 days old" pump, then i tried to push water into the CR, then the pump just started running, hmm need to starting looking at 1264 and see how it performs in terms of heat , or the ultimate is to make a new sump with hole and run the rio 32hf outsump, but worried the rio might not last , headache