Ahh I stand corrected. I meant Flourish. Apologies.Not true.
Excel is a single product by Seachem... It's a carbon supplement, and the active ingredient an isomer of glutaraldehyde. It is not a family of different compounds.
Flourish is a fertilizer family by seachem, and there's several different versions of that. Most folks mean Flourish Comprehensive if they just say Flourish.