I was scouring the forums the other night and I was looking at a members thread..goes by the name of sonny...if any of you know him or have seen his tanks you know that they are amazing. so I was going through a thread and I was wondering how the heck he kept the tank and glass soo darn clean. I have been told my tank is very clean and all that but his was spotless...I later found out in the thread that he uses probiotics..so im thinking "man I need to use those big time"..which leads me to my questions. Which probiotics do I use and why?