Are you using the regular tapatalk app, or the aquarium advice branded tapatalk app?
I don't know what the interface looks like on droid, but I would assume it would look similar to iOS... so if you're not using the Aquarium Advice branded app, that may be the issue. Even though it's the same software, I don't think it's guaranteed to work.
"What, exactly, is the internet? Basically it is a global network exchanging digitized data in such a way that any computer, anywhere, that is equipped with a device called a 'modem', can make a noise like a duck choking on a kazoo." - Dave Barry