Hi,i have an approximately 18 month old GSP (2 inchesd long) and hes kept in a 20 gallon(UK) brackish tank.temp is 76F,ammonia 0ppm,nitrites 0ppm.He is the only fish in the tank and it is partially weeded with some rocks.
Up until last week he has acted like puffers do,begging food etc.He then...