Bro.. IMHO for a fowler tank if u can maintain the water temp below 31°C should be fine. Dun hv to buy cooling fan. U'll end up spending more for the maintenance. Like u I started off with 2ft tank and NSW bought from fish farms. With just 2 nemos and a boxer shrimp with sand and a few live rocks, I managed to keep the LS alive for 6 mths with bi-weekly 10% water changes.