Soo I'm having issues with diatoms and some green algae on the walls of my 75G tank, I acquired this tank already established from craigslist, it was overstocked but I gave some fish away. Planted with anubias and some dwarf sags. I'm struggling with nitrates not going below 40 (might be higher), diatoms, and green algae. I started dosing some ThriveC. Later I was reading excel could help with algae issues, and I was thinking increasing plant growth would help decrease nitrates, so I ordered some, but I forgot ThriveC already has some carbon in it. Should I return the Excel or give it a shot, dosing both the ThriveC + Excel? Does ThriveC increase nitrates?