Don't need blackwater extract, that is for fish that thrive in softwater. Depends on what kind of dat you are getting if you need brackish water. I have kept ATs in freshwater for years, but to me they don't seem to thrive in it. Those first couple dorsal spines are nothing to fool with, but fortunately when they are out of the water, dats tend to stay still.keonigt;3996925; said:do i have to put black water extract?
or what do i have to do with the tank if they like it brackish?
and the spikes, do they hurt when you grab them?