Yep, its 4 drops per gallon just used some, I just acclimated a new rock arch i made from several smaller pcs. and just placed it in my DT yesterday. From start it was ammonia daily 16 drops in 4 gallons in a bucket with a heater & a pump, and tested daily for ammonia lvls before adding more until lvls began dropping, it took 3 weeks to finally consume all the ammonia daily & also show no nitrites only nitrates. I had the temp high at 85 also to speed things up as well as adding additional bacteria to the bucket and a couple small pcs. of LR from my DT also. I added an extra week with additional testing & water changes to be certain all cycling was over as i was removing some LR & replacing with new dry rock that is at least bacteria cycling so i didn't have any ammonia or nitrite issues. Takes about 3-4 weeks TBH usually.