Well, I had a topic running a couple of weeks ago voicing my concerns over high nitrates in my 250ltr fully planted discus tank. Most replies sighted over feeding and not enough water changes. I explained this wasn't the case ad I have high nitrates in my tap water. Installed my nitrate reactor despite slot of sceptical opinion, and promised an update. Well, happy to report its working very well. Tested last night. tank at 50 mg/ltr, water returning from reactor less than 20mg/ ltr. Tank was at 100mg/ltr so heading downwards nicely.