I just went the carbon route as well; I bought the drop in sleeve from redsea since I have a redsea 170; if it doesn’t work well there I’ll go get a mini BRS reactor and a small maxi jet to tumble the media.Still trying to get set to do a water change, I think the salt water I used from my LFS to start the tank is just crap, but all my paramus are in order except maybe a little high magnesium if I remember (currently at work sorry) 1500 last time I checked. I'm currently waiting on carbon to come in, but don't have a reactor. Was gonna drop a small bag inside my filter sock to get direct contact and flow. I do have algea growing on rocks but not that, it's more of a brown hair algea. My trochus snails cleared all of that up. Then along with diatoms or another algea in my sand bed. Not cyano can say that for sure. Thankfully.