My 125 gallon tank has a decent amount of bga on a moderately planted tank. I have dosed excel for 3 days straight and did a little bit of spot treating but there is so much of it that it would take all day to spot treat. Would normally dosing bga with excel generally do some damage to the bga? I recently got CO2 injected into the tank so I finally have that going for me now, but I am still battling the bga from when I was a low tech tank. Just wondering how I should dose with excel in a tank this size and generally how long I should wait to see some progress... Thanks!!!