hi guys, my fish have been dying lately, which is annoying since my tank's been running for two years
the tank's aerated and all, parameters are good, i havn't added suppliments lately, probabily the only thing that could be changing is my RO water, i don't have an RO filter so i purchase water from some local store, is that usally bad? well this RO store did say that he uses a mechanism for cleaning empty gallons before usage; by cleaning them with soap and then washing them with hot water and finally with RO water. should that take care of the soap traces? what else could be happening at the store that i might not know of? any past experiences would be really appreciated. thank you.