40 gallon big enough sump?

[PteroisVolitan15B]

Would a 40 gallon be a big enough sump for a 125 gallon? I've been told by too many that my 30 wouldn't be big enough and I can't get the 55 all the way in the stand Thanks for any feedback

 

[S.Reef]

should be fine

 

[PteroisVolitan15B]

With a fuge being in the middle, will there even be a need for a bubble trap?