I got API root tabs in hopes they'd do well enough to help my Amazon swords grow, as they were yellowing. I put 2 tabs into one side of my divided 10 gallons last night, and now see reddish orange spots all over my black sand. My setup makes the tank have 3 parts (1 4ish gallon side with a betta, a smaller MAYBE one gallon space, and another 4ish gallon side with a betta), the tabs being put into one of the betta slots. The sand in that slot and some of the sand in the middle section has turned rust colored. I've heard some people say similar things about these tabs, but does anyone know why this happens and what it is? Also worth mentioning that the plants seem to have gotten worse, now browning.