Roger the calcium reactor is working great. To up date the readers Roger helped with advice on set-up and selection of a Tunze calcium reactor. I am using the current Comline reactor with the Tunze co2 control unit. The calcium level is at +- 400 and alk is 9.0 to 9.75. I am using one bubble of co2 per second and about 80 drips per minute of effulent. Now for the questions the fit in my sump is perfect for a Comline skimmer will the depth of eleven inches of water give good results? I saw in the release the information on the new skimmers in the Comline box. Worth the wait or not? I have a 120 gallon tank of lps and soft coral. Next question are the Comline cartrige filters a good choice for the use of carbon and or Rhowphos/ Phosban ? Thanks Bill