Lots of warm water fish species are more prone to fungus in colder water when they are injured, stressed and not eating. It is not uncommon. Many of the small fish that get this are eaten by larger fish early in the fungal development.
as always... spot on with my limited experience.. these losses are not uncommon when doing what i am doing. I am not worried and sticking to plan... my thermometer says 62 degrees and this is less than 2 hours after a 70% water change. My house temp is around 70 so the temp isnt exactly bouncing back up, just staying in the low to mid 60's... with water changes every other day the water temp has been staying down.. this is not ideal but i dont expect it is excessively stressful..
i just finished filling my new outdoor grow bed with new substrate and re-arranging my fish tanks... so i now have an empty tank and i am considering lighten-ing the fish load in each indoor tank by 25-30 fish in both tanks and moving the excess to an outdoor tank. This would allow me to focus back on the main objective and stop messing with the water temperature to keep chemistry safe... i dont think the water changes are a big cause of stress but it's not no stress.
on the other hand.. many of the fish are getting less scared of me and some of them seem to understand that when they see me there is a high probability of blood worms spontaneously appearing.
