Φ9 basically means 9mmWait because how do I figure out how large the hose is? On WB it says Φ9…idk what that symbol means…
This was all I could get in terms of hose measurements.
That hose looks like it has a 1/4in ID, which would have about 9mm OD.
that is smaller than what we have usually seen on these tanks.
This may be a god course of action.It says return hose 16
Maybe you should reach out to saltwater aquarium
Is it the correct dimensions?
Can you measure the hole size on the back glass? The proper stock nozzle and elbow require about a 0.6in hole.
if that hole is big enough for that size pipe, then maybe you could simply get Waterbox to send you the proper pluming part for the tank you where sold.
they have it listed here
Nozzle Kits
CUBE Nozzle AIO Y-Nozzle Medium Nozzle Large Nozzle AIO 10 CUBE - AIO 15 PENINSULA - AIO 20 CUBE ✓ AIO 25 PENINSULA ✓ AIO - Waterbox Aquariums
waterboxaquariums.com
This is that same part, linked to above, showing the measurement of the part that needs to pass through the back glass.

