Scientific Name - Carinotetraodon lorteti
Common Names - Common Red Eyed Puffer
Care Level - Medium. This fish is sensitive to very small amounts of ammonia or nitrites and requires frequent water changes.
Size - 2 - 3 inches
pH - 6.5 - 7, but can adapt to a wide range of pH if acclimated properly. Mine lives in a pH of 8.2 quite happily.
Temperature - 76 - 82 F, around 78 F is just about perfect.
Lifespan - somewhat unknown, probably around 5 years.
Origin / Habitat - Asia, slow-moving rivers and ponds
Temperament / Behavior - Very aggressive, especially one male to another. Females are reportedly somewhat less aggressive than males, but this is still not a community fish.
Tank Size - 10 gallons for one, 15+ gallons very heavily planted would be required for a pair.
Tank Mates - This is most certainly not a community fish. The only suitable tank mate would be more of the same species, and some individuals are too aggressive for even that and must be kept alone. It may be possible to keep ghost shrimp with them but they will likely end up as dinners at one time or another.
Breeding - Unlikely, but has been achieved. They seem to like a lower pH of around 6-6.5 for spawning. Courtship is aggressive, and ends with the male driving the female away after she deposits the eggs. Materials like java moss are preferred to lay their eggs on. The parents should be removed once the fry are free swimming. The fry are reportedly picky eaters, with some breeders being successful with infusoria or micro-worms.
Fish Disease - Not particularly prone to any specific disease, but like all puffers, they are especially sensitive to water quality. Also, no medication containing copper should ever be used.
Feeding / Diet - It is extremely rare for them to accept flakes, and even if they do they won't be getting proper nutrition. They should be fed frozen bloodworms, daphnia, and small shellfish/shrimp. Water snails should also be fed to keep the teeth from getting too long, but make sure the snails are not too big or the puffer will eat the soft body only without touching the shell.
Tank Region - Middle/bottom, except at feeding time.
Gender - Females have a much more intricate and lacy pattern than the males. Males also may have a red stripe on the belly, although this may only be noticeable during spawning.