Certainly Raising TDS...
Seems like a lot but, assuming the CaCl2 is the hexahydrate ad 1.5-teaspoons (5.5-g) per gallon and will yield around 270-ppm Ca2+. Assuming the MgSO4 is the hexahydrate (Epsom salt) adding 0.5-teaspoon (2.5-g) per gallon will yield about 65-ppm Mg2+. The general hardness will increase by 942-ppm as CaCO3, or 53-dGH. That is very hard water it also might precipitate the carbonate hardness.
The reason I presented the increased hardness as 3-parts Ca2+ to 1-part Mg2+ is the laxative risk to the fish. This much increase in hardness should be done over the course of a week or two.
You are also adding 470-ppm Cl- and 257-ppm SO42-.
This addition alone places you at 1062-ppm TDS, increases the osmotic pressure 58.3-kPa (0.583-bar) at 25C (77F).
You are now calculating TDS in part-per-thousand (ppt), a range generally reserved for brackish water.
Last edited by JoeRoun; 09-22-2014 at 02:39 AM.