That's cool. I figured I ticked you off with the wet foam comment. I would be proud too if I built that skimmer. What a monster!
Anyway, to go back to your other thread, how much rock do you have? Just eyeballing your tank, I would say you have about 1 lb / gallon?
Personally, I wouldn't sweat it so much and might even leave them in because 1 lb / gallon is a little low for this conversion in my opinion. What are your nitrates now? If they are not that high, what is to worry about?
Perhaps the best approach would be to take some out, maybe 20-40 percent and check your nitrates again over the next few weeks or so. If they go down, great! Then leave it alone and keep checking, eventually removing more and more. Is this what fsshub was saying? I am not sure.
Or if it ain't broke, don't fix it. There is something to be said for that too. Once I overharvested some maco-algae from my tank because I was sick of doing it all the time. Then nasty micro-algae moved in and took its place. That sucked.