new substrate question

[dfish2077]

OK in my 55 gallon planted tank I have regular gravel. And I use root tabs and a liquid feet. Called seachem flourish. I'm wondering is this enough for my echinodorus and anacharis plants or should I scrap the old gravel for something more useful to the plants like iron fortifyed substrate or something like flora ax. I know if I get new substrate it will be a huge pain in the ass. So I was wondering if y'all had any suggestions on how to do this easier. I'm working on getting a new double t8 48" two bulb set up. So things hope full things will go better. Thanks