The Rhizomes are not buried, They are just gently placed between the rocks and driftwood. I am running pressurized co2. I did just start using excel and did the intitial dose of 3 cap fulls but now I have only been dosing 1 cap full daily along with ADA Brighty K and ADA Green Brighty Step 2 daily. Could the initial dose of excel have killed them? Is excel bad for Anubia species? Do you think they will recover?