If you have a 125 liter marine tank how many pounds of salt do you need to put in it as you bought two boxes you bought a 8.8lb box and a 2lb box you have put in the magority of the big 1 but reads1.0?

To achieve a typical salinity of around 1.025 specific gravity in a 125-liter marine tank, you would need approximately 3.5 pounds of salt per 5 gallons of water, totaling about 35 pounds of salt for the entire tank. If you've already added most of the 8.8 lb box and the salinity reads 1.0, you'll need to add more salt. Given that you have used most of the larger box, you may need to use the remaining salt from that box and possibly the entire 2 lb box to reach the desired salinity level. It's important to measure the salinity as you add salt to avoid overshooting the target.