Two tanks, one sump - who's doing it?

[MaxFlow]

Thanks for the hint
So looks like he is running a single drain pipe without a valve and, in addition, takes an advantage of the fact that the two frag tanks are the same height. Also no emergency drain. I wander how loud it is. Hard to say from the video.

Since my sump has only two inlets, and to reduce the number of pipes, I have been thinking about the following setup

However, it will result in the main (1.5", black thick line) return not running a full siphon. My concern is that it will result in a significant noise.

 

[ca1ore]

I’ve had multiple tanks plumbed into a single sump for years. In my current system, the main display overflows into two tanks that in turn overflow into a single sump. It’s really not complicated. You just have to make sure there’s adequate capacity in the sump to hold all the drain down water in the event of a power loss. I also keep dedicated and redundant drain lines for each individual tank.

 

[MaxFlow]

..... two tanks that in turn overflow into a single sump. It’s really not complicated........

Did you merge pipes before they entered the sump? I expect the thicker, 1.5", pipe to never be fully filled with water what may cause gurgling.

You just have to make sure there’s adequate capacity in the sump to hold all the drain down water in the event of a power loss. I also keep dedicated and redundant drain lines for each individual tank.

Yes. That's taken care of. Sump will have 11 Gallons of spare capacity and I expect a combined 4 Gallons of drain water from all the tanks. The sump will also have an emergency overflow going to the drains and the fish-room will have an emergency drain going to the backyard. It is second floor, so I am a bit paranoid

 

[ca1ore]

I do not merge overflow drains, though since my sump is in the basement I don’t worry much about noise.

 

[RecoveryReef]

I'm running a 125 with a 20-gallon display fuge, both connected to a sump. Not sure if that's what you're looking for but it's essentially what you talking about. The 20-gallon can be disconnected/isolated from the main system by simply closing the feeder line.

I’m confused with plumping. I don’t want to have multiple pumps to feed the other display How can I had a similar setup but move the 20gal Algae display outside the cabinet?