Aquariums and bridges

[BillT]

Once set up it would be easy to maintain (my guess).
I automate water changes and have two or three conductivity controllers going.
I would consider the bridges more of a hassle to set and to maintain.
On the other hand, bridges going up (which in my mind makes for the difficulty because of removing air that gets in) might keep the different waters from flowing together so easily.

If it were done with bulkhead fittings (straight through the tank walls), the water could flow back and forth but air leaking in would not be a problem. The greater rates of water exchange would require more and larger new amounts freshwater and more slat pumping in under control of the conductivity controller.

[big b]

I meant the freshwater to saltwater thing.

[BillT]

Yeah, that's what I was talking about.

If there if a lot of exchange, blending the waters together, large enough inputs of freshwater and salt water (with appropriate removal of excess water) would be able to overcome those differences.

Not clear if I answered your question thoiugh

[big b]

Sorry, I wasn't understanding it at the time when I posted that. I understand it now. Also you did answer. my question