If thats the theory i would recommend using biodigest pro bio, more diverse set of bacteria. I do use mb7 periodically with my concotion. Just used chemiclean for first time in my tank as well, cyano wasnt getting better left alone.Cipro/amox at night followed by MB7 in the morning. Each day for 7 days. Same time. Thoery is replacing any "good" bacteria that the cipro/amox kill.