Hello I have a 40 Breeder with Hob skimmer roughly 45 Gal total My Nitrate has been testing 0 for a bit so I purchased some Stump Remover to raise up to the 5-10 level I mixed 2 tbsp to 2 cups of water mixed and dosed 10 ml then tested 15 mins up to a hour later Still Showing 0 Should I keep dosing until I get a reading or continue with 10 ml daily till it builds up on its on?