It's taken over my tank. I bought some kent marine tech m to fight it. I have 150 gallons of total water volume. My mag is at 1425 ppm. I need to get it up to 1800. I've read i can raise it by 100 ppm a day. The directions for yhe tech m says that 1ml per gallon will raise the mag 18.3 ppm. I'm not sure how much to add at since my test kit (salifert) only goes up to 1500 ppm. I really need help and any advice is welcome. Thanks for any help

