Well, they say 1 tsp/5 gallons (i have no clue what this would look like in ppm). i have a couple swords in different tanks. One of my tanks is -SG 1.005- ,,. For the first 2 days the swordtails in this tank were flipping out, now they are acting normal, so my question is do any of you keep swordtails in brackish water, if so, at what specific gravity? Can they handle 0.015?? sorry im asking such lame questions ;}