Planted Tank Guru
Join Date: Nov 2009
Location: Missouri united states
Cannot speak to what the nutrient content is in "Thrive" or dosing calls for.
Will say that if it is magnesium that may be in short supply,will see near instant greening with it's addition.
Hobbyist GH test only tell's you what hardness is ,not if it is comprised of mostly calcium ,or magnesium.
Can buy separate test,or call water Co., but I might try adding a pinch as mentioned as process of elimination.
If It is not the issue,then you haven't really hurt nothin by tryin.IMHO