if you do 1 tbsp to every 3-6 gallons you should be fine. if it is allenbatrachus grunniens then it will do fine in fresh with 1 tbsp to every 6 gallons but but if it is batrachomoeus trispinosus then you should do 1 tbsp to every 3 gallons. hope this helps, from the pix it looks like the latter.
