Little late the the thread lol but will the 75 fit with a glass lid? I also have a 40g breeder and looking into these filters!Tidal 75 will fit top-to-bottom easily (inside the tank). It has a telescoping intake tube that goes way shorter than what my 2 current HOB tube lengths (in 40B) are set at,,, if that's what you mean.
I'll defer to others on power head / wave maker suggestions.
Interested in seeing what you get and how you like it.