UPDATE: Tested copper a while ago and read 0.49 at Hanna checker, will re-check again after 3-5 hours, then check again tomorrow. Meanwhile, I gave a piece of nori and looks like the PBT is eating. All fish don't eat much except the Scribbled who eats like a pig. Hopefully everyone goes through the whole process. I've also observed a little aggression from the Purple Tang, nothing major, but might be concerning. Any idea what to do @4FordFamily ? Or should I just let it go and continue to observe?