If you can't hook up an RO/DI for whatever reason, do like everyone is saying by using a deionization filter such as the Tap Water Purifier for water changes, siphon out what you can during WEEKLY water changes, increase water movement to eliminate dead areas, install a media reactor such as the Phosban 150 reactor and utilize either Phosban or RowaPhos Granular Ferric Oxide, don't use the aluminum based ones such as Kent's or Seachems. Try to use the media in the forementioned reactor. A reactor will be much more effective than in a media bag in your sump, change your carbon or start using some if your not, put the EV-240 that you got from MSHUR to work and overskim (wet watery skim)that puppy, cut your feeding down to half (don't worry, fish are cold blooded so they do not need to exhaust all that energy to keep warm like mammals do, a 30-60 second feeding is good for now, and if your bulbs whether actinic or MH are over 12 months old, change them.