[titus]

Hello,

Yes a small skimmer would pull out a lot of dirt, but a large skimmer would pull out even more dirt.

I'd assume that it's going to take about the same time to cure whether you have a lot or little rocks. But less die off for sure if you have less rocks to begin with, and the second cycle won't be as bad since you will have some rocks in it from the first batch. However, getting in two occasions give you the opportunity of getting rocks from different locations so maybe slightly better bio diversity.