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1: Why can't you fill the sump higher? And raise the skimmer.
2: You can add an extention piece to the top of the highest baffel. Just cut a few inch piece and silicone it on top of it.
Is there any concern? Only if your getting micro bubbles in the display tank.
They both do basicly the same thing. They adjust the air water mixture. Do you have anything in there now? On one of mine, I just put a straight pipe in there the level of the waterfall. Now I don't hear the water falling.
Theres a place on Shrewsbury Ave that carries them in stock. Can't remember the name off the top of my head. No it wont mess up your truck. Theres already holes in your frame to accept this.