I was at my LFS the other day looking around on the freshwater side and told the owner i wanted something more interesting in my 10 gallon planted tank..he made a few suggestion then mentioned these pygmy puffers Tropical Fish for Freshwater Aquariums: Indian Dwarf Puffer I did some research on them when I got home and came to the conclusion i could put a few in my 10 gallon. The biggest thing that i can see being a problem is their aggression..but i think the general rule for them is 5 gallons for the first and 2-3 gallons per other fish..and the tank has to be heavily planted or filled with decor so set up different areas for each fish..i have quite a few plant and driftwood so I think i'll be okay..I went with 3. The other thing is they're really messy so 50% water changes weekly are suggested. They will be here tomorrow so I took my tetras back to the store and got my tank all cleaned up for them! they're also the only puffers AFAIK that require zero salt in the water..they are also supposedly very personable and watch your every move. I'm pretty excited!! Not really asking for anything i guess..just sharing! But if anyone has ever kept these little guy let me know! I want to soak up as much info as I can!