Hmm, I'm not sure the MTS are to blame. I've thousands in my 180 with no issue and several benefits.
Many moons ago I had/caused two die offs from water changes, for different reasons.
From a neglected (2+ months w/o a water change) tank that had far different water parameters than the tap water I was adding, with a large water change. I felt awful.
Another time, I changed water shortly after a heavy rain fall, which my city increases the chloramine concentration to combat. I believe I had 1.5-2pmm of untreated chloramines that did in a number of fish, and caused a mini cycle. I now test TDS readings in my tank vs tap, and if I suspect increased chloramines from the cities published average I do a test, and increase prime to needed dosage.
Many moons ago I had/caused two die offs from water changes, for different reasons.
From a neglected (2+ months w/o a water change) tank that had far different water parameters than the tap water I was adding, with a large water change. I felt awful.
Another time, I changed water shortly after a heavy rain fall, which my city increases the chloramine concentration to combat. I believe I had 1.5-2pmm of untreated chloramines that did in a number of fish, and caused a mini cycle. I now test TDS readings in my tank vs tap, and if I suspect increased chloramines from the cities published average I do a test, and increase prime to needed dosage.