Critique my simple sump designs for a large system please

[Mr. Brooks]

I'm designing a large sump for my multi tank system. I'll have a 300 gallon display tank, 135 gallon fuge/mangrove display tank and small frag tank all tied into one sump. The sump's main purpose is to have a common area for water to drain, get skimmed, heated, de-gased and returned. One problem I have right now with my current sump (similar to version 1) is that the water at the top of the drain or sock section becomes stagnant and collects a film. I'd like to avoid that with this sump. I've drawn two designs. I scanned the drawings a couple days ago and have recently decided not to run filter socks. So please ignore the "sock chamber" label at the bottom. It's now just a drain section. I'll be running reverse durso's in the drain section. Four Ehiem pumps will be running in the return section. I expect no more than 3,000 gph to go through the sump. Tell me if you think version 1 will create a stagnant film situation or if you think there will be enough flow going through to avoid it. Version 2 would take care of stagnant water at the top but could possibly allow micro bubbles to pass over the first baffle.


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