Why is my skimmer going nuts?

[jason604]

My new tank has just been set up n there nth in it but live rock(was cycling rock in a bin that was been acid/bleach washed) and live sand with about 5lbs of live rock from my other tank. Skimmer was working perfectly for about 4 days until yesterday when I found it overfilling n going nuts. It's been a day and it still going crazy. I tuned it to make it lowest possible lvl but still not good. What's going on that's causing this? All I've been is dosing some vodka n vinegar to jumpstart my bacteria count. Also used fijicrete 3 days ago but it was fine the day after. Skimmer is a vertex IN 180