I am setting up a 450 gallon tank and I have a couple of questions, I've never used a wet/dry before. The pump for the wet and dry says its 3000 gallons per hour, I'm wondering how much that's decreased at a 6 ft. head and if this would be enough filtration? Also I understand I can put the heaters in the filter as opposed to directly in the tank, would (2) 1000 watt heaters be about right? Any suggestions where to order heaters from would also be appreciated.