I have a hammerhead to a 4 way then it splits to 6 outlets all 1" plumbing, it blows the sand and corals really hard if I am not careful how i aim the nozzles. I'd think for a 125 thats way too much, you could close the outlet size down with a ball valve I guess, but if it were me I'd use a 1/4 h.p. pump and you will still not run it full on with only 4 outlets I am guessing. I know 1K per nozzle doesnt sound high but if you could somehow make the pattern more like a tunze stream then you'de be o.k. its just such a sharp type flow that I think you wouldnt like it you know? I have a hammer laying around your welcome to hook it up and try it before you buy one if you'd like, I would need it back though, its a spare for mine incase I have a problem.
Chris