Dwarf puffers again

We've got some more dwarf puffers. One never looked that happy and disappeared after a week or two, but the other is happy and seems to have reduced the number of snails in the tank.

Dwarf puffers deceased

We found the second of the dwarf puffers we bought recently dead today. The first died earlier in the week. One had curvature of the spine, and since it was the only fish effected it seems most likely that it was genetic.

Dwarf Puffers

We bought two dwarf pufferfish (Carinotetraodon travancoricus) on Saturday.  I chose them partly because I like puffers, but also because they should keep the snail numbers down.  We think we're got a male and a female, but it's not that easy to tell when they're young.  They're currently the smallest fish in the tank at 1.5-2cm and should grow to around 4cm.  I've researched dwarf puffers on the internet and found differing opinions on how aggressive they are, some people have found them to be extremely aggressive, but so far ours are fairly peaceful.  There seems to be a consensus that they need an interesting tank with plenty of places to explore, which hopefully our tank is.

Links:
The Puffer Forum - Carinotetraodon travancoricus & Sexing dwarf puffers

Current tank contents:
Black Neons (6)
4 Kuhli Loach (4?)
Dwarf Puffers (2)