I doubt ill bother with otto's they need to be in a group of 3 or more and if im going to have 3-4 puffers there wont be enough space. Im thinking of trying shrimp, but not sure.
Sorry guppy_man, I wasn't trying to put you off shrimps at all. I love having the shrimp-DP setups. May I suggest keeping some non freshwater breeding shrimps with them? For example, filter shrimps, red nose shrimps, Amano, Ninja shrimps, etc...
Nice setup btw Love the plants, not sure about the sticks they look a little too erect and "architectural". Can't wait to see your DPs