But... What about our lps and anemones? I swear the lta poops like a giant tang.Yes and no. Most corals will consume ammonia as a nitrogen source before it can be converted to NO3, so lots of little mouths is a good thing.
3 more might be good.... 8, not enough rock.Just do what I did and get 8 for my 180 lol. I hate coralline. I am using 25-30 year old and never dry rock that has only sparse patches of it. It clogging pores on rocks has been a reason I have experience nutrient issues aka old tank syndrome, at least IMO. I added urchins, rocks got cleaned off and then nutrients dropped back to what they had always been. No other changes.