Last night I put some food in the pipe and my kuhli loaches have since colonized I'm thinking I might put some snails in there to get the puffers interested. The kuhlis are pretty much bottom dwellers so I don't think they'll be hangin' out up in the loop I'll keep the pics flowin'!
Sorry these pics are kinda crappy. The kuhlis stay so low in the tube it's hard to get a good angle on them... and they swim so fast it's hard to focus! These are my best shot for today