yes it is! I have also posted another thread on the plants I'm planning to use/ need advice on.
Link in case you can't find it: Thick Plants?
I use the Flourish Liquid and it works really good in my planted tank. I get mine in Petco cause that’s the only pet store around.
Save your $25 and get Nilocg Thrive and Nilocg root tabs. It'll set you over budget a little, but both flourish and the root tabs don't contain enough macronutrients, especially NPK. I cannot stress the importance of reading the nutrient analysis of any fertilizer enough. Also, the Nilocg root tabs are $0.23 each, and Seachem root tabs are $0.80 each, for less nutrients. The API CO2 booster is not really CO2 and isn't very effective, like all other carbon boosters out there.
I looked over your other thread, dwarf hairgrass is a medium-difficult plant and likes a soil substrate and ideally injected CO2. What substrate and light are you using?