the assessment was based on this: i have always prided myself (first problem) on having a testless nano reef. the only params I know about my 15 year nano reef are its temp at water change time because i put a thermometer in the change water, and I know its salinity at water change time. the actual tank has a black marker dot for the water level, so as that drops I add freshwater up to the dot and that holds my salinity in place because there isn't any saltcreep, its solid.
well one day I noticed all my corals lightening which is strange, bulletproof pico reefs arent supposed to do that. so I waited and it got worse. in two weeks near total whiteout of my 15 year system I was freaked. I accused kessil of having bad lights (second problem lol i was bleaching, forgive) and I accused lfs of selling me bad mix water of poison.
then what really happened was my heater konked out and for about eight weeks straight the system had been at 65-68, only to be spiked to 78 during water changes, the only time I was taking temps.
so, I bought a new heater, a dang thermometer for my reef, dropped the light intensity and upped the feeding and water changes and rehabbed it all back. my mixed reef did two months at 65 u got this