OKay now im going to try and add some detail to my second question as well
I have an aqua tech powerfilter, one of those filters that hang on the back of the tank.
It has two seperate cartrages in it, A bio fiber (never get replaced for bacteria culture) adn another filter (i assume its the carbon filter, this is the one the manufacturer says to replace more frequently then alot of people reccomed me to do)
On the back of the filter there is filter box that keeps the two filters fully submersed in water while the filter is on, This is what my brother used to add some sort of rock into (im unsure if it was coral, lavarock, etc) I'm assuming is was so a bacteria culture could be established there as well.
A few concerns i have in regars to doing this is my water pH and the hardness/softness of my tank water. I have read a few articles on the inter net about adding certain "substances" to the tank will changes the water chemistry.
An (possibly inaccurate) example of what im talking about is adding chorle to my tank could chang the water pH
all i wants is another place bacteris can establish but I'm afraid of messing up my tank in the process.
has anyone ever done this to there tanks?
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