Joining two tanks

[jesusq]

I have a main 120 Gal and a side 55 Gal tank which I would like to connect together and share the same filtration system for less maintenance and saving on cost. On the 55 Gal, I’m thinking of putting slow breed fish such as sea horses, pipe fish or garden eals and possibly a few corals.

The two tanks are on separate rooms.

I was thinking of running two hose through the attic to exchange water between the two tanks since the large tank is more than capable.
I’m afraid of because of the different heights, that in case of a power failure that a continuous spill may take place. What would be the best method to hose two tanks?

[jeb102385]

Imo its a terrible idea. If you get something in one tank it will be in both. Ich, parasites, etc...

[jesusq]

I'm concerned more on water spill in case of a power outage.


Sent from my iPhone using Tapatalk

[Austy16414]

You can always just drill a hole on your return piping to break the syphon in case of an outage. Not sure exactly how it would work with both tanks, but it's worth looking into

[LordBarron7692]

Not sure of the name but its like ball valves

[Andrew_B]

Are the 2 tanks in rooms next to each other? Are they drilled/reef ready? Have the 120g drain into the 55, then the 55g drain down into the sump, then pump back into the 120g. You could use siphons, but you could need a few extras incase a siphon fails, you still have enough of them running. I personally would only do it if they're drilled and in adjacent rooms.