For the 2ft, i found that the 130's flow-rate seems about right, i lowered the outflow to around 80% as i prefer abit more gentle current, so there is still some buffer to increase flow if i need to. I guess for a 1.5ft, you might probably lower the outflow abit more to 60-70%, depending on how much current you want and the height difference between the tank and the filter.
The handle is used for both locking of the canister as well as priming it (and its also a carry handle), i find it sturdy enough, you'll really need to crank it in the wrong direction with a fair bit of force to break it.
Imho, it should be very obvious to most users if they encounter resistance in the handle not to continue forcing it in the wrong direction.
Yup, you could still do priming the traditional manual method.
I actually only ever needed to do the priming function once during initial setup though, after that i didn't need to do it anymore during regular maintenance as the inflow double-tap keeps water retained in the tubing. So all i need to do is just connect everything up after maintenance, then open the inflow tap and water refills the canister and basically gets "re-primed" on its own.

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