Thanks for the ideas. Do you keep your dwarf pufferfish isolated in their own tank or can other fish be housed safely in the same tank?Well, what kind of fish do you like? And what kinds of plants do you want? There are a lot of possibilities!
I have a few small (10-20g) planted tanks that go something like this:
-dwarf pufferfish: 3 puffers, lots of plants and rockwork, and plent of snails for the to eat all day long.
-tetras & corys: small schools of candinal and rummynise tetras and a 7-piece school of panda corys. Lots of plants and some cherry shrimp
-rasboras & corys: a school of scissortail rasboras, a school of pygmy corys, lots of plants, and a couple biiig snails.
You can go a lot with a 15g tank.