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If you are just useing 2 buckets id reccomend that you just do 2 DWC or bubble buckets since it would not be very hard to monitor them...
Id reccomend going with 6" hoods for 600W and id also say that it would prob be a better idea to vent lights and room from 2 seperate ducts and...
i dont think you need to worry too much and even if you were usein a couple of 1000 watters go water cooled and even flir prob wont be abel to see...