You are saying you keeping those A/S or band crs?? Selective breeding keep cull all that have colour fading than you selective breed but if you are refering to those thickness on PRL than you looking at the wrong one. Normal Crs will not achieve that thickness er... unless you go raise their GH high but that will cause your shrimp to die from molting too hard to molt out of the old shell.
Only way you can try is selective breeding those that you have and deem than as thick shell. Unless you intend to pay for some high end prl and wouldn't mind ruin the gene to mix with your current crs to enhance the gene. That is if you have too much to burn if you do than better go PRL
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