I understand your concern about potentially losing your shrimp, crabs, and pods, but I think there's a very good chance they will make it through the treatments fine. I did two treatments in my 90g 1 week apart and didn't lose any shrimp (including a harlequin shrimp I was sure I was going to lose) or crabs. A couple crabs looked dazed but didn't die. My pod population did take a hit, but came back very quickly.