5" is a good size to grow out, last ones I had were pushing 1ft. Orange ones are a colour morph, also get full blue morph. I dont know where the orange morph comes from(PNG or SE Asia I think) but have a source for full blues. Will let you know when I'm ready to move them on or if I get any blue morph in.
I always notice more evaporation when it's cold. My theory has always been the heated water in a cold (dry air) environment will evaporate faster than when it's hot and the heater isn't working very much.
Yer evap is affecting me 2, mostly on by Bn breeder tank.
I just got a new fish, a 25cmish Sooty grunter, i put him with my jar to see what would happen and they get along fine, i moved the whole tank around so its all new Territory, i got a good pic of him 2, have a looksy!