planted tank for razorback musk

so i have a pretty heavily planted tank that i would like to add a razorback to, but i have some growing concerns.
- substrate: currently tank is planted with caribsea Flora-Max. My main concern would be impaction. has anyone used this stuff before? its no where near as big as regular aquarium gravel, but its larger than sand.
- C02: currently the tank is not pressurized with C02, just using Seachem Flourish excel, but was thinking of doing pressurized down the road. would this cause ill effects on turtles?
- lastly, Would plant ferts like seachem flourish and flourish excel be harmful to the turtle?
im assuming that the seachem line of plant ferts would not be dangerous to the inhabitants of the tank, most set ups that i have seen that are medium to heavy planted and are dosed with floursih tend to have bountiful amounts of all kinds of aquatic life. looking for some thoughts and opinions?
*edit*
back to the first point i made about substrate and impaction: im wondering if my carpet of dwarf hair grass is thick enough if it would even be an issue, if the turtle cant get to the substrate. this is not my tank, but it is a good representation of what it looks like currently, just on a smaller scale. https://www.youtube.com/watch?v=siA5ZpFJork. i will be redoing my aquascape and adding more moss covered driftwood and rearranging some of the rocky outcrops and what not to cater more towards a razorback habitat.
- substrate: currently tank is planted with caribsea Flora-Max. My main concern would be impaction. has anyone used this stuff before? its no where near as big as regular aquarium gravel, but its larger than sand.
- C02: currently the tank is not pressurized with C02, just using Seachem Flourish excel, but was thinking of doing pressurized down the road. would this cause ill effects on turtles?
- lastly, Would plant ferts like seachem flourish and flourish excel be harmful to the turtle?
im assuming that the seachem line of plant ferts would not be dangerous to the inhabitants of the tank, most set ups that i have seen that are medium to heavy planted and are dosed with floursih tend to have bountiful amounts of all kinds of aquatic life. looking for some thoughts and opinions?
*edit*
back to the first point i made about substrate and impaction: im wondering if my carpet of dwarf hair grass is thick enough if it would even be an issue, if the turtle cant get to the substrate. this is not my tank, but it is a good representation of what it looks like currently, just on a smaller scale. https://www.youtube.com/watch?v=siA5ZpFJork. i will be redoing my aquascape and adding more moss covered driftwood and rearranging some of the rocky outcrops and what not to cater more towards a razorback habitat.