No that's cool...I just wanted to be sure we're talking about the same thing...
"Sometimes" some people talk about the OD of the pipe rather than ID or I'll hear...
"I dilled a 1" hole in my tank for an overflow...now what do I do..?"
(not much, you can't even put a 1/2" bulkhead in a 1" ..."hole"...)
OK, so now let's narrow down a few more items...
1. 29 gallon sump..."ALL" 29 gallons for the sump ??...or are you going to divide this out into a "sump/fuge" and by the time add baffles and lower the water level you end up with 7 gallons for a sump...??
2. "Middle flow" for softie/reef/fish...135 gallon tank...I'm thinking 10X is too low...20X is where reefs are headed...(many pushing 30X) So, 15X turnover or ~2000 gph (in tank/after head loss etc...)
is "middle"...??? Is that where YOU want to set "Goal Flow"...??
3. Do you want to push all that flow from the sump...? You can with the size oveflows you have...we can get a pump that big...But you will need ALL 29 gallons for "sump only" to deal with "turbulance" and bubble/baffle/control...
5. I don't believe in, or reccomend, "ball valves" to control pumps...I say "calc" it out and get the right pump the fist time round...
6. Be aware that if thinking of a Fuge as well your looking at an extra tank...due to flow issues above...No problemo, as long as you have the room for it...(i'm thinking a 40 "breeder" would be perfect...:yes: