| Re: theories of water changes. I don't believe in OTS, IMHO I believe it's a neglected tank. As the tank becomes well established over the years you tend to become laxed in your husbandry skills in time that will cause problems.
I went thru a period of about 5 months with only one water change and even though everything looked good, I decided I wasn't going to chance it because it was becoming difficult to measure accurately the trace elements, so I decided to start doing them again maybe on a biweekly schedule.
__________________ Robert  My Cube “A spirit is manifest in the laws of the Universe—a spirit vastly superior to that of man, and one in the face of which we with our modest powers must feel humble.” Albert Einstein |