Some updates of tank bought a pair of fan from Pasir Ris fish farm. Pictures are as following its abit noisy. And skimmer is working oredi... And a silly way to mimic cloudy skies... And fan comes with switch... Marvellous design, but too bad from China... Fan cools down temp at 0.1 C per 5 mins it takes approximately 1 hr to bring down 1.2 C but its very noisy.