Ok so the last 4 months I used the Magnum Pro 350 with BIO Wheel attachments on my 60 gallon Comm Tank which was a slow build to about 30-35 fish. On my last filter/canister cleaning which by the way has been a chore because of the #($#@& tiny metal clips they spec at the top of that filter. Bend one by mistake and you are toast. Tried to bend it back correctly and ended up breaking the clip pin out of the plastic.
This filter did a fantastic job but the broken clip and difficulty sealing the top after each cleaning was too much hassle, I'll eventually ask marineland for a new canister part or buy one for about $23.
My short term solution has been a HOT Aqueon rated at up to 60 gal. Smart enough filter easy to hook up but is not keeping up with the fish load so this will default to an emergency filter along with the Magnum if I get a new canister part.
Moving on to the Equeim Eheim Pro 3 series (not e).
After all of the above I get to the titile of this thread and that would be a discussion on head.
The Eheim takes the tiem to give their maximum head number to be 69" - In researching head, if my understanding is correct they are talking about distance from top of canister filter to top of aquarium.
I had close to 7ft of tubing going in both directions with the Magnum and had no issues with flow, etc. But 3 feet of that was distance behind a wall not, height from top of tank to filter.
Anyone with expertise on head? Should I take that 69" Spec Eheim gives to heart?
Sorry - mispelled a few words ;)