Any ideas how I can reduce the odour? My LFS tells me “in the days when ozone was used extensively carbon air filters where used for this purpose” – but I don’t know how I could apply a carbon air filter to the skimmer. On another subject, all parameters on my tank look good, healthy and stable. One exception is my slightly low pH which starts at 7.90 early morning and finishes at 8.25 by the end of the day (as determined by a good quality electrical meter). I know vigorous aeration would raise this, but I don’t believe it would look right in the reef setting. My LFS has recommended a Kalk
