I previously asked for some advice regarding a dying plant and was recommended by multiple users to get root tabs. Today I went to the fish store and they recommended api root tabs. I placed 3 in my 20 gallon tank (the package said 6 per 30 gal) and the water is BROWN! like dark tea! the fish seem stressed they are swimming all over the place like crazy. I did a 25% water change and I tested ammonia 0 nitrite 0 but nitrate is 90!!! I don't know whats going and im seriously freaking out! someone please tell me my fish are going to make it till tomorrow when I can vacuum the gravel!