Ok I'm new to this planted tank stuff and just kinda dove in before researching. I currently have a 55g that has been established for years and decided to change up with smaller schooling fish and some basic plants. The problem is I have blue standard aquarium gravel for the substrate. I know this will grow most plants i would want to grow for now but I'm one of those guys whose never happy with the basics for long. So my question is do you think I could pull the decor and plants and scoop about half the gravel out then just fill back up with a better substrate without having to stress to much about cycling and killing fish?