DSB or CC Substrate?

[Mugster]

G'day everyone, I have a question regarding using a DSB or fine CC substrate. After much reading I'm trying to decide if I should replace my CC substrate with a DSB.

My tank is a 180 with approx. 150 lbs of LR and a 3"-4" deep substrate consisting of fine CC. Lighting is 2 Iwasaki 250W 6500k and 1 Iwasaki 400w 6500k and 2 160w VHO URI powered by an Icecap. I dose Strontium, Magnesium, and Iodine. A 55 gal sump (with a trickle filter which will be slowly removed over the next while), a DAS protien skimmer and the start of a refugium (some macro floating freely, no DSB) rounds out the setup.

Is there a definite advantage to using a DSB? As for removing the CC substrate, what is the best way of doing it? I was thinking of syphoning out the CC slowly, approx. a 12" section at a time per week, starting at one end of the tank and moving across. As each section is cleared then replace with sand until the other end of the tank is reached. Is this a good idea or should I just remove it all at once and replace with sand?

Also, is anyone interested in purchasing approx. 150 lbs of fine CC if I do indeed go with the DSB?

Any help or suggestions would be greatly appreciated. Thanks.

Kev