i noticed that my brothers tank gathered allot less gunk than mine other tank, the only difference was the type of sand
mine was crushed coral sand, his was an argonite (spelling) type very white course granuled sand (it almost looked like a crushed white marble)
his not only gathered less gunk but it also looked alot nicer (color) (imo)
why not syphon some out to your dsb in the sump and increase that a bit more?? (shouldnt have any adverse effects, but get some input on that from the experts)