I have a high tech planted tank (albeit crap substrate) I have noticed lately my Monte Carlo carpet does not pearl anymore, and a lot of BBA started cropping up everywhere. I did a vacuum of all the detritus, and now suddenly all my plants seem to be doing well and pearl again. Could the act of vacuuming alter some chemistry in the tank, or alter the heterotrophic/autotrophic bacteria? I was told that you don't need to vacuum in a planted tank because it acts as plant food for my carpet? Could the substrate be a factor of why I need to vacuum? I am using sharp-ish white gravel So now I am doubly confused.