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Yup, low flow is usually required for a camera so as to not burst any seals. It's not like computer cooling where a high flow pump with a high head pressure is required. But just like computer cooling, you do want to be concerned about going below the dew point and having dew form inside your camera on your camera electronics. Running the fan will keep the temperature from going below ambient hence also above the dew point. If you want to go below ambient (but still above the dew point!), then you want to turn the fan off. Only do that if you know for certain you will not go below the dew point, such as when the humidity is very low and the dew point is therefore far below ambient. A large reservoir combined with the low flow will ensure that the water doesn't get a chance to heat up much. It's not like a computer cooling reservoir where you might have limited space inside the case and where the reservoir is really only there to make priming the pump easier. When cooling a camera you can use a five gallon bucket or a even 40 gallon drum if you like!
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