Sump sizing for a 225 peninsula

[Kooma]

I am setting up a 72x30x24 peninsula and have a 48x26x16 rimless tank I am building into a sump. I am hoping to run a 12x26x16 portion of it (About 25%) for a ATO resi, and the rest will mainly be one large area 8" deep with a reefmat 1200, skimmer and heaters in a 24X26X8 area. The return chamber and bubble trap will take up the last 12x26x16 area roughly with a pair of 10,000 l/hr return pumps.

Does this size seem like enough for the display? The stand is also a 72x30 with internal space of 26.5x68" roughly. I'm trying to avoid a separate ATO tank to leave lots of room for reactors, storage and electrical. My RODI storage is within range that I could plumb it into the ATO with my Apex so if the ATO lasts 10 days or 3, it isnt a big deal.

Thoughts?

 

[TX_REEF]

your actual sump space excluding the ATO section should be ~65 gallons if my math is right. I don't see an issue with this, as long as you ensure the sump running water level and the amount of water that would drain from your display in the case of a pump failure or power outage allows the sump to handle the drained water without overflowing. I generally like my sump to be at least 25% the size of my display, and your setup falls in that range.