Spiritofthesoul;4880870; said:
depends on your bioload. how much waste do your fish produce.
test your water parameter. As long as
Ammonia - 0
Nitrite - 0
Nitrate > 0
you have sufficient bio media for your current stock.
That would be the Holy Grail of fish keeping, if you could get your bio media to rid the tank of nitrates.
Just busting your ceramic rings

Pretty sure you didn`t mean to add nitrates to your list.
As far as how much bio specific media you need for a healthy tank, pretty much depends on many things.
Type of filter, number of fish, size of tank, cleaning schedule, yadda-yadda.
Is this for a tank that is not yet running?
Are you trying to get all your materials in hand before setting up a new tank?
I question your statement, "
I know that their is no such things as too much bio media ".
You can have an excess.
It won`t hurt anything, but there is a point where the amount of bio media is unproductive.
You might be surprised at the number of tanks that have no bio media and are just as healthy as ones with a truck load.
No set rule for amount of media per fish.
All you can do is get some, put it in your filter and check your water.
If your tank can process 3-5ppm of ammonia down to zero in a 18-24 hr. period you have plenty.
Keep in mind, the bacteria will set up shop all over your system, not just in media.