Hi,
Thank you for sharing your DIY method, just picture only still not so clear to explain the
idea. U try to use heat exchanger method that borrow from computer cpu right? Here i have
few serious concern regarding the method i am not sure your alluminium heat sink touching
the water or not, if YES ;-) the alluminium will pollute your tank water especially for NANO tank and after one week of use the heat exchanger will not so efficient due to cover by the detritus film from your tank water and that's is why we try to use RO water for our computer water cooler system and car radiator. If your answer is NO :-)you can try enhance the system by replace the heat sink to copper base because copper are more better heat exchanger compare to alluminium. Nice experiment Bro :-)hope to hear more update from you.