Two 300w heaters might work fine and you can always add one down the road if you need it. I think using a controller of some sort is necessary in case a heater sticks in the "on" position which could cook your tank. I have seen and heard of that happening in the past quite frequently. For some reason, self-contained heater controllers are usually cheap.
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The wind blew, the chit flew, and then they came two by two.
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Current Tank Info: 375g Tanganyikan Tank & 470g mixed reef
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