go with whatever space that allows the unit to mount flush...if it's too thin the dry part will actually fall a little away from the glass. I used the rubber gasket on mine. Reef Crest naturally will create a "lagoonal" period...so I'm not sure what you're trying to ask here....but I know alot of people with Vortechs keep it on Random (Reef crest mode)
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75 gallon with 20 gallon sump in the works.
R. Bacchiega. Tattooer
I didn't smack you, I simply High Fived your face.
I've got so much glue on my pants it looks like a Friday night gone horribly wrong.
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