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Ron, go with whichever suits your budget. The Hailea150 is sufficient for cooling your 55L tank. But then again, so is the Hailea 100. As for brands, the Hailea and Resun brands are ok. Resun is a bit cheaper. JBJ is a great all rounder in efficiency, quietness and price. Teco is a step up in price and emphasises on quietness. The TC range has heater incorporated, so you can do away with traditional heaters. Tradewinds always seem to come out on top of reviews - but don't know where you can buy this in Oz. Tip - Whatever chiller you end up with, the worst thing you can do for it is to store it in an enclosed cabinet, like the aquarium cabinet. The heat just circulates and the unit becomes inefficient. The chiller's radiator needs to be outside a cabinet to access cool air and expel hot air. Another tip - Once you have more than one tank to cool, and you don't have a sump type setup, and you start getting into the $thousands, you might as well look into reserve cycle air conditioners that will cool the whole room.