Fugu Puffer

Takifugu puffers are aggressive to alot of other fish, I had mine in a freshwater for a while with a TSN and black ghost with no problems for a while, if I introduced a new fish, the puffer would attack it. They do have to go into brackish eventually with a higher ph. Usually within a year old. Some say you can keep scats or monos with them because they are fast enough to get away but I suggest to keep them alone.

Oh and have a sand substrate because they love to bury and hide in the sand when they sleep, about 3-4 inches deep minimum.

I have read that the most commonly offered takifugu puffer is in fact a coldwater to temperate fish and as such should be kept at lower than tropical temperatures (20 degrees C and below).

If you do have the puffer at tropical levels, try and maintain vigorous surface agitation to ensure the oxygen levels are as high as possible.