RB the worst that can happen is it starts coating the parts of your moving components, given enough time without equiptment maintanence it will do it anyways, cant have your cake & eat it too!
your output is around 6.8 yeah so give yourself a high flow area or build a small bottle neck for which the flow can run. Honestly if you used that beautiful melon between your sholders, im sure it does take a genious to work out that you place the output down stream from the
skimmer if thats what concerns you.
Personally, food is the only thing that should be added to the
DT. Everything else gets added to the
sump, doing it this way allows achieveable time to bring elements into a state of equlibrium before they hit the
DT.
Post up schurans recommendations please RB. They have world class gear, so there might be another contributing factor why they are saying that. Maybe even come down to possible acidic level milking the housings or attaching rubber componantry, however i have a feeling its a general "long life" equiptment warning for those of us you cant or haven't utilized our
sumps thoughfully.