Brackish waters are where the rivers meet the oceans. There's a constant mixing ocurring, so parameters flucuate.
FW is 1.000
SG. Some will say 1.005
SG (Specific Gravity) is brackish others will say as much as 1.015
SG. I am aiming for 1.010. My saltwater tank is 1.025.
I don't think my puffer has spines, I haven't seen him puff yet. They are only supposed to do that when they are stressed or scared and as much as I feed their greedy arses... they can't be stressed.