my question is What would u prefer for my 40 gal. reef set up a fluidized sand bed or a Wet Dry trickle filter and why?
>>Actually, either will work just fine. There are those who argue that either methods are actually “nitrate factories”, but the simple fact is that without utilization of a good deep sand bed or refugium (which can house a DSB) along with sufficient good quality live rock you’ll be hard pressed to experience DE-nitrification (the end cycle that occurs in anaerobic areas of a DSB that turn nitrates into nitrogen). So, what I really suggest is not worrying about which of these two methods you use, but instead be sure that you have something in place to denitrify. >>Here’s a very good link (w/links within) that will help clarify. Best of luck!