[Luis A M]

John,thanks for the description!
I use a net,of a fine mesh though.I also scoop fish needing to be separated with my fingers.Granted,this is kinda stressful for the fish and sometimes one or two are temporarily shocked,but recover.Resistance to stress has to do with the nutritional status of the fish and commercial breeders perform similar "stress tests"to evaluate this.
I use small square specimen container if I need to move very small juvs like damsels,neon gobies or shrimp which can´t take being netted.
On a side note,I don´t use any hiding places in the grow outs.I imagine they could encourage territorial and agressive behaviour.