I have had weed and feed mix in my tank for nearly 2 weeks because of the weather. Should I dump it? Use as normal? Add extra 2 4D? It's an expensive mix: Urea, iron, Mechamine D, Aquacap, and Imidicloprid. Will the 2 4D still work? There is no ammonia or other strange smell. I estimate there is $150 worth of product in there. Please advise.