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@aquamedic305
Tank your size use just one return.
I've only ever used one. If you want another, @tbrown is the way to go.
Don't use return for flow, wavemakers/powerheads will take care of that. I run very little flow through my sump.
Sump won't back siphon/overflow any more water than how far your return is under water.
My return is right at the surface. You can test that when you get the system running.
Run it then turn it off. Then you'll know.
Everything looks great so far.
I am bare bottom but when I did sand a couple of times I did rock, sand, water.
Put a small plate/bowl/bucket and poured water into that. Sand will settle out in a couple days .
Best I found after 40 years is tubing hooked to a pump and pump the water in.
Better control, slower than dumping.
I've mixed salt in the tank and before, no worries either way just keep salinity the same.
If I were to do it again I'd heat all the water first.
Tank your size use just one return.
I've only ever used one. If you want another, @tbrown is the way to go.
Don't use return for flow, wavemakers/powerheads will take care of that. I run very little flow through my sump.
Sump won't back siphon/overflow any more water than how far your return is under water.
My return is right at the surface. You can test that when you get the system running.
Run it then turn it off. Then you'll know.
Everything looks great so far.

I am bare bottom but when I did sand a couple of times I did rock, sand, water.
Put a small plate/bowl/bucket and poured water into that. Sand will settle out in a couple days .
Best I found after 40 years is tubing hooked to a pump and pump the water in.
Better control, slower than dumping.
I've mixed salt in the tank and before, no worries either way just keep salinity the same.
If I were to do it again I'd heat all the water first.

