Were they advertised as CBB/morphs from the same clutch? Any chance they are WC and stressed?
Because of they're multi genes I'd say 100% cbb I wish at this point it would be a simple explanation like this. These babies are stressing me the heck out
Did you confirm temps using a temp gun or digital thermometer, or did you go by what the thermostat says? If it is the latter, I would confirm temps on each tub just to be safe.
I have been feeding in the evenings usually around the time its already gotten pretty dark. I have also tried the hair dryer method most of them just ball up more.