guys no need to guess anymore,this is what i study for many yrs,agressive when shown on curious,feeding and fighting = stable
timid,take cover to camouflage. = unstable
stable untable = genetic born in this way.
black ground, DW,water etc what ever is nothing to do with the stablility..."fish change base COLOUR on blackground" i do agree.when u change anything..they show some curious or agressive and let u see colour.
ST and NNT gene are more stable in a way,IT like to camourflage and more timid.most of them will stable "not all" when they grow bigger cus they are more braver.some take mth,yr depend of fish clar....."forget the spelling"...
later free i might explain more.