I'm preparing my tank for an octopus. And this time I want it to be near perfect, or at least a healthy living enviroment! So far I have done the following... 1) Recently changed 99% of the water & 50% of the sand (it was nasty!) 2)Put in a few inverts and a baby puffer *to break i the tank (*I'm sure theres some scientfic word for that...) 3) Planted a few healthy aglea thingy mabobs... 4) Scrubbed the tank clean of Algea. 5) And tottaly cleaned and tweaked my filtration sytem. What I know i have left to do is... 1) Put rocks and pvc pipes for octo. 2) And Get a large substantial food supply. 3) Do that PH thingy... I HAVE NO CLUE HOW!!!!!!! AH! Also I was wondering will debris from rotting plants hurt the tank?