If you are having trouble setting up and connecting your GHL Doser 2 to your Android device using their app. this post might help you.
down load the App on your Adroid device here.
http://downloads.aquariumcomputer.co..._V100_BETA.apk
Once downloaded tap the top right corner and select "Add new connection"
Once selected beside "Name" type "GHL-DOSER2" and beside "Host" type "10.10.100.254"
then tap "Yes"
After that you will see a GHL-DOSER2 icon. Before you can connect to the Doser2 you will need to go into the wifi connections on your Android device and select the GHL-DOSER2 network. Once you have selected the GHL-Doser2 network you can go back into the app and connect to your doser.
Good luck and happy Dosing!