There's really no such thing as too much flow in the saltwater setting, so you can always add more powerheads and/or upgrade the current powerheads.
Ideally, you shouldn't need to clean the rock and the combination of the powerheads & the clean-up crew should take care of 99% of the gunk.
Ideally, you shouldn't need to clean the rock and the combination of the powerheads & the clean-up crew should take care of 99% of the gunk.