Awesome, i've been using Kalk in my top off to maintain 8.0-8.3 How long does the media last? I'm concerned about how much it will cost in the long run. I get my Kalk from walmart and its pretty cheap.Hello everyone! Been reading the thread and I’m in the bird road area, I’ll be interested in being a part of the trades and meetings! To answer your question, I began using one three days ago and highly recommend it. My pH before was from 7.9 to 8.1 now I’m at 8.1 to 8.4! I love it! I got the BRS co2 scrubber and I’m using two little fishies CDX media in it.