45mm Props NEED HELP

[monojeff]

They are graupner 45mm counter rotating props which are going to be pushing a twin 550 brushed 32" mono which I will be using as a retrieval boat.

The motors are proboat apache 550s.

I am not sure what the pitch is on the props but it says hydro on them which I did not realize when I got them.

Can I possibly cut them down or should I get new props??