I agree with you that it can kill some of the benefitial HHs, but if you dip the rock for 60 seconds, it is still effective. Although either method is not 100% it is better than nothing. I saw a link on either this site or another site talking about some guy doing a seltzer dip and then putting the LR
in his tank. His wife then asked what the creature with the stalk eyes was? LOL
. It turned out that the mantis shrimp was too stuborn to leave the LR
Nemo, you should also check all your rock before putting it in your tank. After I had TWO mantis shrimps invade my tank from some large LR
pieces you learn your lesson fast.