I have the TLF 150 Phosban Reactor. I have been pretty happy with it so far. I have a 30 gallon tank with no sump. can I am trying to figure out how much ROWA to use. I know that if too much is used it can affect the alkalinity. I have used a conservatively low amount. I have noticed the tumbling of the Rowa is less when I use less media. I spoke with Two Little Fishies and was told the Reactor works best with three inches of media. I think that would be too much Rowa for a 30 gallon. Any ideas/suggestions?