Hi Walter,
Here are a couple of threads that speak alot about this:
Misting with a Mazzei - Questions and Observations
Can I adapt a Mazzei to my setup?
I have a 180 myself and am considering going to a Mazzei.
I was thinking of a 584 or 684 Mazzei to go with my 1800 gph pump. From what I understand, the Mazzei is excellent for apps where a lot of flow is available.
I was thinking of going pump to Mazzei to splitter to dual returns. My pump is a little too big for my overflows, as the water level in the tank goes right up to the top of them. If I decrease the ball valve, the overflows can handle it and it skims better
I was thinking that the Mazzei would reduce some of this pressure so the overflows worked better, and get better c02 distribution at the same time. I also want to add an OC filter or two to the mix.............
If you go built-in overflow (reef style) the waterfall inside will cause c02 loss. There are ways to combat this (durso standpipe, etc).
I know Tom likes to plumb canister filters to these pre-drilled setups......
You can create an airtight cover for your sump using plastic garbage bags and duct tape. I have used just duct tape on mine as the uncovered portion is small, but have since stopped as the amount of c02 used seems to be small, at least to me. I have to re-fill every 8 weeks anyway, so no big one to use a little more c02.
My media is in a separate tower and has a cover, so is probably easier to cover than a tank.......Perhaps you can DIY something similar????
You shouldn't have to be in the sump that much anyway
I always have several extra sponges in there to filter dirt and act as a bacterial media.......
Speaking of more, a 180 is a decent sized tank, so think about how to automate your water changes now
A drop in spare pump and flex hose to drain is an excellent investment until you can figure out an optimal auto setup.
You will need more c02, ferts, etc especially if you plant heavily........Light depth is also more important as your depth is 24"
Hope this helps.
Keep us posted.