Hi depdiver,
The section "Describe your tank(s)" will not be added to your posts. Someone will have to click on the profile button under your posts to see your tank info. If you would like to add this information to your signature line under your posts, go back to "Update your Profile" and type your info in the signature block, and then scroll down to Preferences and make sure to specify "yes" in the "Always attach my signature" option. You can add your tank info in your signature line and still keep your current signature if you want.